What was found
IDA- AFTER TAKEOFF WHEN GEAR WAS SELECTED UP, LEFT MAIN GEAR UNSAFE LIGHT AND LEFT GEAR DOOR LIGHT AND GEAR HANDLE LIGHT CYCLED ON AND OFF 30 SECS BEFORE FINALLY GOING OUT. INSPECTED AND FOUND UPPER DOOR CONNECTING ROD BOLT WORN AND LOOSE FOR LT MLG DOOR. REMOVED AND REPLACED BOLT IAW TR 32-250, DHC 400 AMM 32-12-06-000-801 PARA 4, STEPS (7) AND (8), AND 32-12-06-400-801 PARA 4, STEPS (1) THRU (4). NO ADJUSTMENTS MADE, PERFORMED MULTIPLE EXTENSION AND RETRACTION OPERATIONAL CHECKS. NO DEFECTS NOTED. RETURNED TO SERVICE.