What was found
MCN - MAJOR REPAIR - DURING C-04 CHECK FILIFORM CORROSION WAS FOUND ON UPPER SURFACE OF RT INBOARD CABIN SEAT TRACK AT FORWARD END OF FR 20. MAINTENANCE REMOVED CORRODED RT INBOARD CABIN SEAT TRACK AT FORWARD END OF FR 20; FABRICATED A NEW REPLACEMENT SEAT TRACK; INSTALLED REPAIR PART IAW A320 SRM 51-42-11 PG 28-30, 32, 39, & 41, FIG 12, 13, & 18.