What was found
MCN - MAJOR REPAIR - DURING C-20 CHECK FOUND 2 CRACKS IN L-1 DOOR SILL ATTACH ANGLE BRACKET AT BS 302, LBL 66, WL 207.5. MAINTENANCE REMOVED CRACKED L-1 DOOR SILL BRACKET AT BS 302, LBL 66, WL 207.5; FABRICATED A NEW REPLACEMENT BRACKET; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02 FIG 8 & 12 PG 1, 38 & 45.