My 2018 Miramar 35.3 also leaks but it's the window on the dinette slide. If I have a steady rain, it will start dripping down the inside of the window near the dinette. Also, the cover along the top of the window that hides the blind when it is up (not sure what you call it) gets wet towards at the top righthand corner at the front of the slide. Mine has been in the shop for a month. It only seems to leak when the slide is out. I have driven through several heavy rains and have not had the leak.
They have supposedly found where it is leaking (this is the second time I've had it in for the leak). They said there was some type of tape that had folded over towards the front end of the slide (on top). It left a small crack and supposedly it would leak into the window framing of the slide. I haven't gotten the motor home back yet so I don't know if this fixed it or not.
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