What was found
(CAN) AFTER TAKEOFF FLIGHT CREW WERE UNABLE TO RETRACT LANDING GEAR AS THE LANDING GEAR CONTROL HANDLE WOULD NOT MOVE TO THE RETRACT POSITION. THE CREW SELECTED THE OVERRIDE SWITCH WITH NO RESULTS. THE CREW DECIDED TO RETURN TO DEPARTURE FIELD AND MADE A ROUTINE LANDING. MAINTENANCE PERSONNEL CONDUCTED TROUBLESHOOTING AND FOUND THE LANDING GEAR SELECTOR TO BE AT FAULT. THE LANDING GEAR SELECTOR WAS REPLACED, ACFT JACKED AND FUNCTION TESTED SERVICEABLE. NO FURTHER FAULTS WERE NOTED.