What was found
DURING C-03 CHECK CORROSION WAS FOUND ON THE UPPER AND LOWER SURFACE OF CABIN FLOORBEAM AT Y512, FR 66 -1 TO +5. MAINTENANCE REMOVED CORRODED FLOORBEAM FROM FR 64 TO FR 70, Y512; FABRICATED A NEW REPLACEMENT FLOORBEAM; INSTALLED REPAIR PART IAW A320 SRM 51-42-11, PG. 6 & 7.