What was found
DURING HEAVY MAINTENANCE,NSIDE AFT CABIN CORROSION ON FLOOR BEAM FRAME 66 STR 23L ON Y1292; REMOVED & REPLACED FLOOR BEAM Y1292 FR 66-64 STR 23L. APPLIED CPC AND TOP COAT TO FASTENERS IAW A320 SRM 51-72-11-911-001, A320 SRM 51-75-12-911-002 AND A320 SRM 51-23-17.