I had a similar problem. I will try to find my post on the issue. In the meantime where and when do you notice the leak?
Is it on the end of the slide or somewhere in between? Do you see water with the slide closed or only when it is open? Little details like this are key.
I had a leak visible at the end of the slide when it was in or out. Turned out to be the slide seal between the slide and coach was about a 1/4 inch too short allowing water to enter at the bottom of the seal.
I had another slide leak all the time under the dinette. Turned out to be the outside slide trim was not sealed correctly. The water was dripping through the gap and onto a metal trim piece on the bottom of the slide - a nice little raceway to the inside of the coach. I sealed the trim and shifted the metal trim about a 1/4 inch from the outside edge of the slide to make a weep area.
I’ll send pictures when I get home later tonight.
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