What was found
CAPTAIN REPORTED THAT DURING CRUISE AT 39,000 FEET, THE MAIN LANDING GEAR RED LIGHT TURNED ON AND MAIN LANDING GEAR GO DOWN WITH LEVER IN OFF POSITION, THEN LEVER WAS POSITIONED ON UP POSITION AND LIGHT TURNED OFF. MAINTENANCE PERSONNEL REPLACED THE LANDING GEAR SELECTOR VALVE AND RT MAIN GEAR LOCK UP ASSY IAW MM 32-31-51 AND 32-32-31, OPERATIONAL TEST WAS CORRECT IAW MM 32-32-00, ALL CORRECT.