What was found
AIRCRAFT TOOK OFF, PILOT NOTICED LANDING GEAR HANDLE NOT RETURNING TO NEUTRAL AND THAT THE AC WAS YAWING. ON APPROACH, COULD NOT GET LT GEAR DOWN AND LOCK LIGHT, C/W MISSED APPROACH, THEN FINALLY GOT LT GEAR DOWN AND LOCK LIGHT, LANDED WITH NO PROBLEMS. MAINTENANCE FOUND LT GEAR ACTUATOR BROKEN. REMOVED AND REPLACED LT GEAR ACTUATOR.