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Bill,
That concerns me a little since your floor plan is basically the same as mine.
Here is an idea. Assuming the hydraulic cylinder is ok and that it has simply come out of adjustment, with the room retracted (in), try pushing the bottom of the room in. If it moves in and seals and then moves back out, then the dealer is correct. It is that the jam nut on the end of the cylinder shaft has loosened for some reason and simply is not pulling the room in far enough.
Remember. All hydraulic cylinder pistons MUST be bottomed in the end of the tub or cylinder end cap so that it can not damage the room flange or facia when it is sealed in either position.
If your dealer needs more help, have him call.
I am curious how that nut would have loosened because it is a nylok nut. Unless a critter was doing a "log roll" on it! :-)
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