There is no audit trail in Attendance or Lesson Monitor.
The History of changes Report will:
Show students who have had a change of mark recorded within the specified date range. All changed marks and their reason for change are shown.
When a session mark is saved, SIMS checks if a mark already exists. If an existing mark is found, the change of mark and the reason for the change is recorded. The exception is where an N (no reason yet provided) has been changed to a reason for absence, e.g. from N to M (medical/dental). This is because N is a temporary code that is expected to change.