diff --git a/app/celery/letters_pdf_tasks.py b/app/celery/letters_pdf_tasks.py
index f83d71ca6..52308636d 100644
--- a/app/celery/letters_pdf_tasks.py
+++ b/app/celery/letters_pdf_tasks.py
@@ -187,7 +187,7 @@ def process_virus_scan_passed(self, filename):
     scan_pdf_object = s3.get_s3_object(current_app.config['LETTERS_SCAN_BUCKET_NAME'], filename)
     old_pdf = scan_pdf_object.get()['Body'].read()
 
-    new_pdf = _sanitise_precomiled_pdf(self, notification, old_pdf)
+    new_pdf = _sanitise_precompiled_pdf(self, notification, old_pdf)
 
     # TODO: Remove this once CYSP update their template to not cross over the margins
     if notification.service_id == UUID('fe44178f-3b45-4625-9f85-2264a36dd9ec'):  # CYSP
@@ -235,7 +235,7 @@ def _upload_pdf_to_test_or_live_pdf_bucket(pdf_data, filename, is_test_letter):
     )
 
 
-def _sanitise_precomiled_pdf(self, notification, precompiled_pdf):
+def _sanitise_precompiled_pdf(self, notification, precompiled_pdf):
     try:
         resp = requests_post(
             '{}/precompiled/sanitise'.format(
@@ -248,19 +248,19 @@ def _sanitise_precomiled_pdf(self, notification, precompiled_pdf):
         return resp.content
     except RequestException as ex:
         if ex.response is not None and ex.response.status_code == 400:
-            current_app.logger.exception(
-                "sanitise_precomiled_pdf validation error for notification: {}".format(notification.id)
+            current_app.logger.info(
+                "sanitise_precompiled_pdf validation error for notification: {}".format(notification.id)
             )
             return None
 
         try:
             current_app.logger.exception(
-                "sanitise_precomiled_pdf failed for notification: {}".format(notification.id)
+                "sanitise_precompiled_pdf failed for notification: {}".format(notification.id)
             )
             self.retry(queue=QueueNames.RETRY)
         except MaxRetriesExceededError:
             current_app.logger.exception(
-                "RETRY FAILED: sanitise_precomiled_pdf failed for notification {}".format(notification.id),
+                "RETRY FAILED: sanitise_precompiled_pdf failed for notification {}".format(notification.id),
             )
 
             notification.status = NOTIFICATION_TECHNICAL_FAILURE
diff --git a/tests/app/celery/test_letters_pdf_tasks.py b/tests/app/celery/test_letters_pdf_tasks.py
index 6a4c7f26a..5cbf1a04d 100644
--- a/tests/app/celery/test_letters_pdf_tasks.py
+++ b/tests/app/celery/test_letters_pdf_tasks.py
@@ -22,7 +22,7 @@ from app.celery.letters_pdf_tasks import (
     process_virus_scan_failed,
     process_virus_scan_error,
     replay_letters_in_error,
-    _sanitise_precomiled_pdf
+    _sanitise_precompiled_pdf
 )
 from app.letters.utils import get_letter_pdf_filename, ScanErrorType
 from app.models import (
@@ -364,7 +364,7 @@ def test_process_letter_task_check_virus_scan_passed(
     sample_letter_notification.status = NOTIFICATION_PENDING_VIRUS_CHECK
     sample_letter_notification.key_type = key_type
     mock_s3upload = mocker.patch('app.celery.letters_pdf_tasks.s3upload')
-    mock_sanitise = mocker.patch('app.celery.letters_pdf_tasks._sanitise_precomiled_pdf', return_value="success")
+    mock_sanitise = mocker.patch('app.celery.letters_pdf_tasks._sanitise_precompiled_pdf', return_value="success")
 
     process_virus_scan_passed(filename)
 
@@ -404,7 +404,7 @@ def test_process_letter_task_check_virus_scan_passed_when_sanitise_fails(
     sample_letter_notification.status = NOTIFICATION_PENDING_VIRUS_CHECK
     sample_letter_notification.key_type = key_type
     mock_move_s3 = mocker.patch('app.letters.utils._move_s3_object')
-    mock_sanitise = mocker.patch('app.celery.letters_pdf_tasks._sanitise_precomiled_pdf', return_value=None)
+    mock_sanitise = mocker.patch('app.celery.letters_pdf_tasks._sanitise_precompiled_pdf', return_value=None)
 
     process_virus_scan_passed(filename)
 
@@ -471,7 +471,7 @@ def test_sanitise_precompiled_pdf_returns_data_from_template_preview(rmock, samp
     rmock.post('http://localhost:9999/precompiled/sanitise', content=b'new_pdf', status_code=200)
     mock_celery = Mock(**{'retry.side_effect': Retry})
 
-    res = _sanitise_precomiled_pdf(mock_celery, sample_letter_notification, b'old_pdf')
+    res = _sanitise_precompiled_pdf(mock_celery, sample_letter_notification, b'old_pdf')
 
     assert res == b'new_pdf'
     assert rmock.last_request.text == 'old_pdf'
@@ -482,7 +482,7 @@ def test_sanitise_precompiled_pdf_returns_none_on_validation_error(rmock, sample
     rmock.post('http://localhost:9999/precompiled/sanitise', content=b'new_pdf', status_code=400)
     mock_celery = Mock(**{'retry.side_effect': Retry})
 
-    res = _sanitise_precomiled_pdf(mock_celery, sample_letter_notification, b'old_pdf')
+    res = _sanitise_precompiled_pdf(mock_celery, sample_letter_notification, b'old_pdf')
 
     assert res is None
 
@@ -493,7 +493,7 @@ def test_sanitise_precompiled_pdf_retries_on_http_error(rmock, sample_letter_not
     mock_celery = Mock(**{'retry.side_effect': Retry})
 
     with pytest.raises(Retry):
-        _sanitise_precomiled_pdf(mock_celery, sample_letter_notification, b'old_pdf')
+        _sanitise_precompiled_pdf(mock_celery, sample_letter_notification, b'old_pdf')
 
 
 def test_sanitise_precompiled_pdf_sets_notification_to_technical_failure_after_too_many_errors(
@@ -505,6 +505,6 @@ def test_sanitise_precompiled_pdf_sets_notification_to_technical_failure_after_t
     mock_celery = Mock(**{'retry.side_effect': MaxRetriesExceededError})
 
     with pytest.raises(MaxRetriesExceededError):
-        _sanitise_precomiled_pdf(mock_celery, sample_letter_notification, b'old_pdf')
+        _sanitise_precompiled_pdf(mock_celery, sample_letter_notification, b'old_pdf')
 
     assert sample_letter_notification.status == NOTIFICATION_TECHNICAL_FAILURE