What was found
MCN - MAJOR REPAIR - C4 CHECK - GALVANIC CORROSION ON THE L4 DOOR CUTOUT AFT LOWER CORNER ATTACH ANGLE AT BS 1677 - BS 1680, LBL 65. REPLACED THE L4 DOOR CUTOUT AFT LOWER CORNER ATTACH ANGLE AT BS 1677 - BS 1680, LBL 65 IAW B757 SRM 51-40-02.