My best guess would be water intrusion with the slide closed. Strange but I have witnessed it in my previously owned Southwind. Wind driven water pouring onto the side of the coach made its way through the seal somehow while I was in the coach watching (wild storm). On my Phaeton, water does get carried in on the slide from time to time after very heavy rain, I can see where there might be some leak in a wind driven rain, not as likely from a straight downpour.
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Paul Rocking down the road in our '12 Phaeton 36QSH, (in service May 2012 ) We tow an '11 4 dr Jeep Wrangler Unlimited Rubicon a 2021 Jeep Grand Cherokee Trailhawk - Read my blog at https://goldberg-online.net/
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