What was found
CORROSION IN THE FWD CARGO FLOOR SUPPORT INTERCOSTAL LOWER ATTACH ANGLE, APPROX BS645 LBL 16.5 DOT 129-053. REMOVED, FABRICATED, AND INSTALLED INTERCOSTAL IN FWD CARGO AT BS645 LBL16.5, IAW B757 SRM 51-40-02-0G AND BOEING DWG 143N5367 REV A/REV F. UPON FURTHER EVALUATION FOUND INTERCOSTAL TO BE WRONG MATERIAL, IAW BOEING DWG 143N5367-REV A/F.