What was found
(AIRCRAFT NOT GROUNDED) (DEFECT DISCOVERED DURING AC HEAVY MX VISIT) NRC 1000-0076: 404-30 NOSE FWD FUSELAGE CABIN FLOOR STRUCTURE, RAIL FOUND CORRODED AT Y-254 FR21 / NOSE FWD FUSELAGE CABIN FLOOR STRUCTURE, RAIL BTW FR12-24 AND Y-254 REPLACED AS PER SRM 51-72-11-911-001 REV.158