What was found
LCQ - MAJOR REPAIR - DURING C-04 CHECK A 1/8" CRACK WAS FOUND AT CORNER OF AIR CONDITION GROUND SERVICE DOOR CUTOUT, LOWER FUSELAGE, BS 540. MAINTENANCE BLENDED OUT CRACK AT CORNER OF AIR CONDITION GROUND SERVICE DOOR CUTOUT, BS 540; TREATED AND PRIMED AREA IAW B737-300 SRM 53-00-01, FIG. 101.