Realise this post is a little old, but we have just discovered the same or similar issue with our 2017 31W. It is out of warrantee so trying to figure out the best way of remedying the situation. When we store our coach in the compound and the slide is in it leaks. When we are away and the slide is out we don't have any problems even when there is torrential rain. I could do with a little more info from those of you that have experienced this issue just so I know whether I can fix it myself or need to get some outside help.
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