What was found
MCN - MAJOR REPAIR - DURING C-04 CHECK CORROSION WAS FOUND ON UPPER SURFACE OF FLOORBEAM Y254, FR-16 -17, RBL 254MM. UPON FURTHER INSPECTION A .625 INCH CRACK WAS FOUND IN SAME LOCATION; MAINTENANCE REMOVED DAMAGED SECTION OF FLOORBEAM Y254, FR-16 -17, RBL 254MM; FABRICATED A NEW REPLACEMENT SECTION OF FLOORBEAM AND 4 EACH REPAIR ANGLES; INSTALLED REPAIR PARTS IAW A320 SRM 53-11-14 PG 211-212 FIG 202.