Linda.....you need to do a couple of things to isolate the issue. Try lifting the front end of the coach higher tahn the rear to see if it still leaks. Then do the opposite by lifting the rear higher. Thos will initially tell you if the leak is running from another area.
I had a similar leak that leaked only when closed. It was running from the front of the slide, across the top and down the other side onto the floor. The issue was in the exterior corner where the slide seals against the exterior body.
You can try using duct tape to tape over the exterior corners from the roof (just above the slide) and then down over the corner. Do this as a test to see if you're still leaking.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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