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. INTERCOSTAL IS CORRODED BETWEEN STATION 1263-1285 AT LEFT BUTT LINE 20. REMOVED AND REPLACED INTERCOSTAL AT STATION 1263-1285 LEFT BUTT LINE 12 OF AFT LOWER CARGO IN ACCORDANCE WITH SRM 51-40-02 AND DRAWING 146T5000.