What was found
SAL - MAJOR REPAIR - DURING BC-4 CHECK EXFOLIATION CORROSION WAS FOUND ON FLOORBEAM SEAT RAIL Y765, AT FR 66. MAINTENANCE REMOVED CORRODED FLOORBEAM SEAT RAIL Y765, FROM FR 64 TO FR 66; FABRICATED A NEW REPLACEMENT FLOORBEAM SEAT RAIL PER DWG 18D53472040; INSTALLED REPAIR PART IAW A320 SRM 51-72-11.