We have a 5300 nutri placer, 52.5 foot. When raised up and not moving the wings and main frame all go up and stay up. But if you are moving, everything goes up and both wings settle pretty quick. What would cause this? Ive locked the hydraulics on to push air out like the book says many times. Could the o rings in both wing cyl be bad? There is no external leakage. Thanks.