What was found
ON GEAR EXTENSION ON APPROACH TO OAK, GEAR GREEN LIGHTS ALL CAME ON WITH ALL E DOOR RED LIGHTS AND TAILSKID LIGHT ON. MADE LOW APPROACH AND GOT GPWS VOICE TO LOW GEAR WAVED OFF, FOLLOWED RED TABS. SLOWED TO 200 KNOTS, LOWERED GEAR AND ALL IND NORMAL. REMOVED AND REPLACED LANDING GEAR ACCY UNIT PER MM 32-09-122. ADJ, TEST AND OPS CK NORMAL.