What was found
MCN - MAJOR REPAIR - DURING C-18 CHECK A 3/4" CRACK WAS FOUND ON THE R-1 DOOR FRAME AT INBOARD LOWER END, BS 300, RBL 55. MAINTENANCE REMOVED DAMAGED SECTION OF R-1 DOOR LOWER FORWARD STUB BEAM FRAME AND FOUND SILL CLIP ALSO CRACKED. REMOVED SILL CLIP, FABRICATED 2 EACH REPAIR ANGLES AND NEW SILL CLIP, AND INSTALLED REPAIR PARTS IAW B737-200 SRM 51-40-3, PG. 1-6, FIG. 1.