What was found
FLT 6403 MSY-BNA, DURING HEAVY MAINTENANCE CHECK FOUND FWD CABIN FRAME 17 CROSSBEAM HAS CORROSION ON RIGHT SIDE. MAJOR REPAIR P/N 170-21769-403. REPAIRED BY BLEND, MANUFACTURE L ANGLES, SHIMS, CUTOUT BLENDED AREAS, HFEC INSPECT. LAY OUT FASTENER PATTERNS TO ALL PARTS, ALODINE, PRIME IAW EC E12-701-01.