On our last trip out we lost a slide lock hydraulic hose. I was able to open the "T" handle valves on the manifold and push the slide in easily. I have purchased a new hose from HWH and now I need to manually slide the room back out to access the front top slide lock for hose removal. It will move about 3" then feels like it gets up against hydraulic pressure. Will the slide push out if I remove the slide extension check valve? 2001 U320 with HWH vertical arm setup. Thanks in advance, Brent