What was found
MCN - MAJOR REPAIR - DURING C-04 CHECK CORROSION WAS FOUND ON BEAM Y765 RT INBOARD SEAT TRACK BETWEEN FR 41 AND FR 47. MAINTENANCE REMOVED DAMAGED SECTION OF SEAT TRACK ON BEAM Y765 RT FROM FR 41 TO FR 47; FABRICATED A NEW REPLACEMENT SECTION OF SEAT TRACK; INSTALLED REPAIR PART IAW A320 51-42-11, FIG 12, 13 & 18.