What model do you have? Do ... does the other slide(s) move in and out? Is there something stuck behind the headboard wall? Is your fluid level within about an inch of the top of the reservoir when all slides are in? Answer these and we'll go from there. Usually, the smallest slide goes out first, so the answer may be hard to pin down.
Larry ... this is an 03 ... if it did have isolator valves, they would be right on the pump assembly.
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