We have a '19 Miramar 37.1. We too have leaks from at least one slide. Ours also leaks when closed but nothing when open. It is at the dealer for the second time to try to find it. The first time they said no leak but I must have done something wrong winterizing the unit (there is water damage on a wood panel). After winter, I was able to get a pic of the water running across the floor during a rain storm. I have zero confidence that they will figure it out.
I think it is coming in around the track area. When our slide is closed, I can see daylight around the track.
We will see.
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