I also have the 2017 23MRB. We haven't had that issue. Where are the stains showing, near vents or skylights. While walking on the roof I found two soft areas, right near the ladder and in front of the air conditioner, but sill haven't seen what you are seeing.
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2019 Chevy express 2500 Van Coversion. 2017 Jayco 23MRB: 26' total and Glacier Package. 2 Renogy solar panels. Married 49 years. Haley the mutt, 4 years old. "Excited to learn new things everyday and humbled by those who offer to help." And very grateful to our Moderators!
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