What was found
DISCREPANCY: DURING HEAVY CHECK FOUND: FLOORBEAM STA 727 CORRODED ON UPPER CHORD UPPER SURFACE LBL30, LBL10 & RBL15 EXTENDING UNDER FLOOR SKIN. CORRECTIVE ACTION: CORROSION REMOVED WAS FOUND TO BE OUT OF LIMITS IAW BOEING 727 SRM 53-10-1. FABRICATED AND INSTALLED REPAIR PARTS IAW BOEING 727 SRM 51-40-2 & 51-30-2 DAMAGE AT LBL30 & LBL10 FOUND TO BE WITHIN LIMITS IAW B727 SRM53-10-1 REPAIR INSTALLED AT RBL 15