What was found
(AIRCRAFT NOT GROUNDED) (DEFECT DISCOVERED DURING AC HEAVY MX VISIT)NRC 2000-0043: 404-09 REAR FUSELAGE CABIN FLOOR STRUCTURE, SUPPORT BTW FR69 - FR70 AT STGR23RH FOUND CORRODED / REAR FUSELAGE CABIN FLOOR STRUCTURE, SUPPORT BTW FR69 - FR70 AT STGR23RH WAS REPLACED AS PER SRM 51-42-11, SRM 51-72-11-911-001 REV 159"