What was found
MCN - MAJOR REPAIR - DURING B-04 CHECK GALVANIC CORROSION WAS FOUND ON FLOORBEAM AT FR 66, Y765 RT. MAINTENANCE REMOVED DAMAGED FLOORBEAM AT FR 66, Y765 RT; FABRICATED A NEW REPLACEMENT FLOORBEAM PER DWG D53472209; INSTALLED REPAIR PART IAW A320 SRM 51-42-11, FIG 9-14, 16 & 17, PG 6, 7-10 & 12.