What was found
FWD CABIN UNDER FLOOR STRUCTURE HAD CORRSION, Y720 BETWEEN FRAMES 12A AND 13A. REMOVED AND REPLACED CORRODED FLOOR SUPPORT. LOCATED AND DRILLED IAW SRM 51-40-40, TREATED AND PRIMED IAW SRM 51-21-00. INSTALLED THE FLOOR SUPPORT IAW SRM 51-40-21. MAJOR REPAIR.