What was found
KMIA - LEFT MLG DID NOT RETRACT AFTER NORMAL TAKEOFF. GEAR DISAGREE/GEAR DOOR LIGH TON, STATUS AIR/GROUND DISAGREE ON LANDING GEAR MONITOR. FOUND LEFT MAIN LANDING GEAR DOWN LOCK ACTUATOR FAILED AFTER NUMEROUS GEAR SWINGS. REPLACED LEFT MAIN LANDING GEAR DOWN LOCK ACTUATOR, MADE SEVERAL GEAR SWINGS, CHECKED GOOD. PERFORMED TEST FLIGHT AND LEFT MAIN LANDING GEAR CHECKED NORMAL. RETURNED AIRCRAFT TO SERVICE. (M)