Sorry for chiming in late, but I had a similar problem. Called Lippert and the standard fix if you are in warranty is to replace the pump/reservoir ( >$1,000). On mine, since I was not the original owner and thus had no warranty, Dale of Lippert suggested that I replace the gasket with one slightly larger in cross section diameter. Went to the local hardware store and they made a gasket from a spool of rubber with the larger diameter. I installed it and havn't had a leak on over two dozen slide cycles. I suggest you do the same.
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