What was found
LANDING GEAR WILL NOT RETRACT AND LOCK UP. RETURNED TO DEPARTURE, LANDED SAFELY. BLED HYD SYS, OPS CHECK OF RT UPLOCK RIGGING FOUND SATISFACTORY. REPLACED LT AND RT MLG UPLOCK SPRING, PN 7232360-151. REPLACED LT MAIN GEAR DOOR ASSIST SPRING, PN 7232360-041. REPLACED IDLER LINK AND BUSHING, PN 7232360-131, PN 55016-3-600. FOUND BRAKE POWER VALVE LEAKING, REPLACED BRAKE VALVE. PERFORMED LANDING GEAR OPS CHECK SATISFACTORY.