What was found
PILOT REPORTED DURING DEPARTURE FROM DFW, THE GEAR NOT LATCHED LIGHT ILLUMINATED. THE ALTERNATE GEAR/DOOR WARNING SYSTEM INDICATED THE MAIN GEAR DOOR CLOSED. PERFORMED THE 'GEAR/DOOR NOT LATCHED LIGHT ILLUMINATED' CHECKLIST, AND HAD TO CYCLE THE GEAR 2 TIMES BEFORE SUCCESSFUL UPLATCH CHECK. FOUND LOCKING TAB SHEARED AND LOCKING NUT LOOSE, NOT SAFTIED ON LEFT GEAR DOOR UPLATCH CYL. FOUND LEFT GEAR DOOR UPLATCH MECHANISM OUT OF RIG. ALSO, RT GEAR DOOR UPLATCH PROX SWITCHES LOOSE. COMPLETED MM PROCEDURE 32-31-04. OPS CHECK NORMAL.