What was found
MAJOR REPAIR, DURING 4-DAY CHECK A 4 INCH CRACK WAS FOUND IN FORWARD CARGO DOOR LOWER FRAME AT UP LATCH BRACKET, BS 440. MAINTENANCE REMOVED CRACKED SECTION OF FORWARD CARGO DOOR LOWER FRAME; FABRICATED A NEW REPLACEMENT SECTION OF FRAME; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02, FIG. 2, AND S.B. 737-52A1100.