What was found
DURING C4/S1 CHECK, INSPECTION REPORTED FLOORBEAM Y254 CORRODED ON UPPER SURFACE BETWEEN FRAMES 16 AND 18. FABRICATED AND INSTALLED FLOOR SUPPORT REPAIR PARTS IAW SRM 53-11-14, 51-47-00, 51-23-00, 51-75-12, 51-44-11, EAR 910-4551, AND EA A9-53R-12224.