Curt, I would check the fluid with all slides in and jacks up! On mine the fluid always goes down a little over the summer so I check it all the time, If the fluid is low one of the valves could be sticking, First figure out which valve is the one for the slide that is moving, then make sure that it is clean and not leaking also air in the line can cause this.
Hope this helps you some.
Earl
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