What was found
DURING C-4 CHECK, INSPECTION REPORTED AFT FUSELAGE CABIN FLOOR STRUCTURE FR66, Y1292, CORRODED UNDER NUT CLIPS. BURNISHED CORROSION ON SEAT TRACK/STRUCTURE AT FR66 PER SRM 53-00-15, FIG 101, SECTION E-E, PAGES 101-104. UPON FURTHER INVESTIGATION, MORE CORROSION WAS FOUND. REMOVED FLOOR SUPPORT FROM FRAME C64-C70 PER SRM 51-42-11. INSTALLED SERVICEABLE FLOOR/SEAT TRACK PER SRM 51-42-11 AND A319 DWG D53472815.