What was found
MCN - MAJOR REPAIR - DURING C-04 CHECK GALVANIC CORROSION WAS FOUND ON FLOORBEAM Y1732 LT, FORWARD OF FR 68. UPON FURTHER EVALUATION CORROSION WAS FOUND ON 2 EACH REPAIR FILLERS. MAINTENANCE REMOVED CORRODED FILLERS ON FLOORBEAM Y1732 LT, FORWARD OF FR 68; FABRICATED 2 EACH REPLACEMENT REPAIR FILLERS; INSTALLED REPAIR PARTS IAW A320 SRM 51-41-14, FIG 201, PG 207-208, & 211-212. CORROSION LEVEL CHANGED FROM LEVEL 2 TO LEVEL 1 DUE TO PREVIOUS REPAIR.