What was found
MCN - MAJOR REPAIR - DURING C-04 CHECK EXFOLIATION CORROSION WAS FOUND ON UPPER SURFACE OF FLOORBEAM Y1292, FORWARD OF FR 66. MAINTENANCE REMOVED DAMAGED FLOORBEAM Y1292, FROM FR 64 TO FR 66; FABRICATED A NEW REPLACEMENT BEAM; INSTALLED REPAIR PART IAW A320 SRM 51-42-11 PG 6-7, SRM 51-76-11 PG 9-10 FIG 4.