As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LH AILERON UPPER SKIN WAS FOUND TO HAVE WEAR DAMAGE AT THE EDGE BETWEEN WS302.65 AND WS352.29. PERFORMED PERMANENT REPAIR AIW CRJ 900/700 SRM 57-61-01, FIGURE 57-61-01-991-801, ITEM 3A, EA 69-2021-121. DEFECT LOCATION :S KIN /WS302.65 AND WS352.29