What was found
DURING C4/S1 CHECK, INSPECTION REPORTED MAIN CABIN FLOORBEAM AT FR16, +Y254, CORRODED. DETERMINED CORROSION TO BE OUT OF LIMITS IAW SRM 53-11-14. CUT OUT CORRODED AREAS, AND FABRICATED AND INSTALLED FILLER AND REPAIR ANGLES IAW SRM 53-11-14 AND 51-75-12.