What was found
DURING C-13 CHECK FOUND INTERCOSTAL CRACKED, .25 INCHES IN LENGTH INSIDE FORWARD CARGO DOOR AT CENTER OF DOOR, 20 IN FROM LOWER EDGE OF DOOR AT BS 470, WL 176, STRINGER 23R. MAINTENANCE REMOVED INTERCOSTAL AT FORWARD CARGO DOOR AT CENTER OF DOOR, 20 IN FROM LOWER EDGE OF DOOR AT BS 470, WL 176, STRINGER 23R AND FABRICATED NEW INTERCOSTAL IAW BOEING DWG 69-41861. INSTALLED FABRICATED REPAIR PARTS AT FORWARD CARGO DOOR AT CENTER OF DOOR, 20 IN FROM LOWER EDGE OF DOOR AT BS 470, WL 176, STRINGER 23R IAW BOEING 737-300 SRM 51-40-02-0 FIG 3, 4, 6 AND BOEING 737-300 SRM 51-40-04 FIG 2.