What was found
AFTER TAKEOFF RIGHT GEAR A & B RED LIGHTS REMAINED ON AND IT FELT LIKE GEAR WAS STILL DOWN. WHILE READING QRH, LEFT MAIN A & B RED LIGHTS CAME ON AND AIRPLANE YAWED TO THE LEFT, THEN TO THE RIGHT, FOLLOWED BY ALL LIGHTS OUT.TIGHTENED CONNECTOR AT LEFT AND RIGHT MAIN UPLOCK SENSORS. CYCLED GEAR 20 TIMES. OPS CHECK GOOD.