What was found
HNL - FLT NR 351 - AFT GEAR RETRACTION 'RIGHT GEAR UNSAFE' LIGHT REMAINED ON AFTER APPROX 1 MINUTE. 'GEAR DOOR OPEN' LIGHT CAME ON. RETURNED TO HILO FOR PRECAUTIONARY LANDING. DURING DESCENT SPEED BRAKE HANDLE WOULD NOT LOCK IN DETENTS. DURING DESCENT BOTH 'GEAR' AND 'DOOR' LIGHTS WENT OUT, NORMAL INDICATIONS. THEREAFTER, GEAR EXTENDED NORMALLY. LANDED WITHOUT INCIDENT. REPLACED MAIN LANDING GEAR PROXIMITY CONTROL BOX. LUBRICATED UPLOCK SWITCH. CLEANED SENSORS. GEAR SWING OPERATIONAL CHECK GOOD. OPERATIONAL CHECK OF SPEED BRAKE CHECKED NORMAL. (M)