What was found
FLT 441 - PIT-ORD - WHEN GEAR WAS RETRACTED AFTER TAKEOFF, THE RED LEFT MAIN GEAR LIGHT STAYED ON. AMBER GEAR DOORLIGHT WAS CUT. GEAR CYCLED AND ALL LIGHTS WERE OUT AND NORMAL. GEAR AND DOORS NORMAL FOR LANDING, BUT WHEN AIRCRAFT WAS PARKED AT GATE, THE AMBER GEAR DOOR LIGHT CAME ON. LEFT GEAR DOOR WAS HANGING DOWN ABOUT ONE FOOT. FERRIED A/C TO PIT FOR REPAIR. FOUND LEFT MAIN GEAR DOOR ACTUATOR OUT OF ADJUSTMEN. ADJUSTED AND SAFETIED GEAR DOOR PER MM. (M)