What was found
MCN - MAJOR REPAIR - DURING C-07 CHECK CORROSION WAS FOUND AT FASTENER HOLE ON MAIN CABIN FLOOR SUPPORT AT Y558 (LBL 22), JUST FORWARD OF FR 66. MAINTENANCE BLENDED OUT CORROSION AND FOUND MATERIAL LOSS TO BE OUT OF LIMITS; REMOVED CORRODED FLOOR SUPPORT FROM FR 64 TO FR 70; INSTALLED NEW REPLACEMENT FLOOR SUPPORT IAW A320 SRM 51-42-11, PG. 25, FIG. 9.