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Woodtic ... like I tried to explain earlier ... the hydraulic system in our slides is about as basic as it gets. Basic = cheap to build. There are no directional valves, the pump motor turns one way to extend and the opposite way to retract. Unless things have changed in the past 2 years, the 2 lines going to each cylinder are like branches on a tree. There is a main extend and retract line right off the pump that all the branches connect to. The manual shut-offs are placed in-between the main extend line from the pump and the extend line coming from each cylinder. All the manual shut-offs do is prevent flow going to the extend side of each cylinder. They cannot prevent oil to seep past the cylinder seals or past the check valve in the pump. If any one of your cylinders has a leaking seal ... due to the simple way the system is plumbed it can allow which ever slide that is easiest to move to creep out on its own ... usually the bedroom slide. The same result applies if there is a leak anywhere or the check valve in the pump doesn't seat. Due to the tech pay scale at most dealerships, you'll be hard pressed to find much hydraulic system knowledge. They might know there needs to be oil in the reservoir and the hose has to be hollow to pass that oil, but beyond that it's a toss up. That's why you hear myths about what's really causing your hydraulic issue ... they're mostly guessing. Again, the level-up system is more complex than described above.
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