What was found
MCN - MAJOR REPAIR - DURING C-04 CHECK EXFOLIATION CORROSION WAS FOUND ON UPPER SURFACE OF FLOORBEAM Y-765 AT FR 16. MAINTENANCE REMOVED CORROSION ON UPPER SURFACE OF FLOORBEAM Y-765 AT FR 16 AND FOUND MATERIAL LOSS TO BE OUT OF LIMITS. CUT OUT DAMAGED SECTION OF FLOORBEAM; FABRICATED A NEW SECTION OF FLOORBEAM AND 4 EACH REPAIR ANGLES; INSTALLED REPAIR PARTS IAW A320 SRM 51-42-11 PG 8-10, 12, 28-30, & 32, FIG 2, 3, 12 & 13.