As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENACE PNL 513AT MOUNT FLANGE HAS SURFACE CORROSION. REMOVED SURFACE CORROSION BY HAND AT LEFT WING ACCESS PNL 531AT ATTACHING FLANGE IAW MD-11 SRM 51-21-01 PAR. 36 NO MATERIAL LOSS. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.