What was found
WHILE AIRCRAFT WAS OUT OF SERVICE FOR HEAVY CHECK. CFIII AFT WET AREA FLOOR STRUCTURE FR 84, LBL11, SEAT TRACK UPPER FLANGE CORRODED. REPAIRED UPPER FLANGE USING DOUBLER REPAIR PER SRM 53-23-10 REPAIR 4 PSE53-23-005 FCS NOT EFFECTIVE AIRCRAFT REMAINS OUT OF SERVICE FOR COMPLETION OF HEAVY CHECK.