What was found
DIVERSION / DECLARED EMERGENCY. AFTER TAKEOFF FROM SMF, GEAR HANDLE WOULD NOT MOVE FROM UP TO OFF POSITION. DIVERTED INTO OAK. FOLLOWED QRH AND MANUALLY LOWERED GEAR. GEAR CONFIRMED DOWN AND LOCKED BY THREE GREEN LIGHTS, VISUAL THROUGH VIEWER, AND TOWER FLY-BY. UPON LANDING, THE NLG RETRACTED. DISCOVERED RIGHT MLG WAS ALSO UNLOCKED.