As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - DURING C-15 CHECK MAINTENANCE DISCOVERED AFT CARGO DOOR CRACKED AT AFT LOWER FRAME ON FLANGE BETWEEN #3 & #4 DOOR STOP FITTINGS, AND ON AFT CORNER OF UPPER FRAME AT BS 827. MAINTENANCE REMOVED AND REPLACED BOTH UPPER AND LOWER FRAMES ON AFT CARGO DOOR IAW AWA E.O. 52-33-02.