As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 658 DURING SIDE PLATE REMOVAL WAS FOUND CORROSION ON INTERCOSTAL BTW STA 1400-1420 AND LBL 16 AT AFT CARGO COMARTMENT FLOOR STRUCTURE (IN REFERENCE NRC: 00031). CORRECTIVE ACTION: SUMMARY OF NRC 00387. CORROSION LEVEL 2. INTERCOSTAL BTW STA 1400-1420 AND LBL 16 AT AFT CARGO COMARTMENT FLOOR STRUCTURE WAS REPAIRED PER B757-200 SRM. (1768082)