What was found
MCN - MAJOR REPAIR - DURING C-04 CHECK EXFOLIATION CORROSION WAS FOUND ON UPPER SURFACE OF SEAT TRACK EXTRUSION AT FR 67, Y1321. MAINTENANCE REMOVED DAMAGED SEAT TRACK EXTRUSION BETWEEN AT FR 67, Y1321; FABRICATED A NEW REPLACEMENT SEAT TRACK EXTRUSION; INSTALLED REPAIR PART IAW A320 SRM 51-42-11, PG 39-41, FIG 18.