Water
We had the same thing with our 2016 24.1. We had Redlands Truck and RV remove both of the windows to solve the problem. The joint between the front cap and side walls was secured with about four screws. The joint was covered with a piece of molding that was not water tight either. Found out that the water was leaking through that joint and ending up in a pocket under the side windows. I had a business that handles water damage go to the shop with a pretty cool digital scope look at the walls to see exactly where the moisture was. Cost me almost $2000 to find this issue.
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