What was found
THE FLIGHT CREW REPORTED THE LANDING GEAR UNLOCK ANNUNCIATOR REMAINED ILLUMINATED WITH THE GEAR HANDLE IN THE UP POSITION. THE FLIGHT CREW ELECTED TO DIVERT FLIGHT AND RETURN TO THE AIRPORT FOR MAINTENANCE CONSIDERATIONS. THE LANDING WAS UNEVENTFUL. THE MAINTENANCE VENDOR JACKED AIRCRAFT AND TROUBLESHOT GEAR SYSTEM BY COMPLETING 4 GEAR SWINGS. NO DEFECTS WERE NOTED. DOWN JACKED AIRCRAFT AND RETURNED AIRCRAFT TO SERVICE.