What was found
DURING HEAVY MAINTENANCE, FOUND CORROSION, FWD CABIN. RIGHT SEAT TRACK FRAME 12, RBL 9.5 -12.5 CORRODED. REMOVED CORROSION AT A & B. PERFORMED HFEC INSPECTION. NO FURTHER DAMAGE NOTED. TREATED, PRIMED AND TOP COATED AREAS. REMOVED, FABRICATED AND REPLACED DOUBLER AT FRAME 16 IAW E13-686-03.