Could be one of three things, check valve in pump assy leaking, leaking hydraulic hose / fitting, or leaking internal seal in any one of the slideout cylinders. The selector valves I doubt have anything to do with your problem as they simply block flow when closed to prevent any given slide from coming out. Try closing all the selector valves, that would at least isolate the pump from the rest of the system. In other words, when all the valves are closed and the slides stay in, then the check valve in the pump assy is the culprit.
PS Check your hyd fluid with the slides all the way in ... should be about 1" or so from the top. If it was low and you want to bleed the air from the system, simply cycle he slides full out to full in about 3 times ... the system is self bleeding.
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