As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE LINE MAINTENANCE AT ILN, CRACKS AND BULGING SKIN WAS DISCOVERED NEAR THE LOWER AFT CARGO DOOR CUTOUT. THE INTERIOR OF THE -17 SKIN AND INTERNAL DOUBLERS WERE FOUND TO BE CORRODED AT FS 887 - 917 BETWEEN LONGERONS 26 RIGHT - 29 RIGHT. FABRICATED REPAIR SKIN AND INTERNAL DOUBLERS IAW DC-9 SRM 53-04.