As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT GROUNDED FOR HEAVY MAINTENANCE. AFT LOWER CARGO STATION 1395 UPPER FLOORBEAM CAP CORRODED AROUND SEVERAL NUTPLATES LEFT BUTT LINE 54 THROUGH RIGHT BUTT LINE 54. REMOVED CORRODED FLOORBEAM CAP AND REPLACED WITH NEW FLOORBEAM CAP PER SRM 51-40-02.