What was found
(CAN) FLAP SELECTOR VALVE HAD BEEN REPLACED. DURING TESTING AND RIGGING OF SYSTEM, SYSTEM PRESSURE DROPPED AND THE FLAPS DROOPED WITHIN A HALF HOUR. THE SELECTOR CABLES WERE DISCONNECTED AND THE VALVE WAS OPERATED MANUALLY. IT WAS DETERMINED THAT VALVE WAS LEAKING INTERNALLY. THIS HAD BEEN A REPAIRED ITEM WHICH HAD BEEN REPAIRED AND CHECKED FOR SAME PROBLEM.