What was found
DURING HEAVY MAINTENANCE, INSIDE AFT CABIN CORROSION ON FLOOR BEAM FR66 STR23L ON Y1292; REMOVED AND REPLACED FLOOR BEAM Y1292 FR66-64 STR23L. APPLIED CPC AND TOP COAT TO FASTENERS IAW A320 SRM 51-72-11-911-001, SRM 51-75-12-911-002 AND SRM 51-23-17.