What was found
ON APPROACH, CREW ATTEMPTED TO EXTEND LANDING GEAR AND THE LANDING GEAR HANDLE WOULD NOT MOVE. CREW FOLLOWED PROCEDURES CONTAINED IN THE QRH MANUAL TO EXTEND THE GEAR AND RETRACT THE GEAR DOORS. ACFT LANDED WITHOUT INCIDENT. ACFT WAS SUBSEQUENTLY FLOWN UNDER A SPECIAL FLIGHT PERMIT, WITH THE LANDING GEAR DOWN AND LOCKED, TO MX BASE. MX PLACED THE ACFT ON JACKS AND CYCLED THE LANDING GEAR NUMEROUS TIMES BUT COULD NOT DUPLICATE THE PROBLEM. AS A PRECAUTION THE LANDING GEAR CONTROL VALVE WAS REPLACED IAW THE MM 32-32-00. THE LANDING GEAR RETRACTION SYS WAS OPERATIONALLY CHECKED AND CHECKED FOR LEAKS WITH NO DEFECTS NOTED. ACFT WAS RETURNED TO SERVICE.