What was found
DURING C-4 CHECK, INSPECTION REPORTED FLOORBEAM CORRODED AT FR15, 5TH FLOORBEAM FROM LT. CENTER OF FUSELAGE ON AFT END. DUMMY RAIL AT STATION Y503.2 FOUND TO BE OUT OF LIMITS PER SRM 53-11-14, FIG. 103. REPLACED DUMMY RAIL AT STATION Y503.2 PER SRM 51-42-11 AND 53-41-14.