Maybe there was a leak from the outside seal around the vent. I guess replace with plywood and glue on new rubber. Would replace the vent fan with one that moves more air. I don’t think there would be that much condensation and rot in just a few months. May have been leaking new. We run bathroom vent fan, open another window in coach to bring in fresh air, and wipe water out of shower after use. It also helps to dry towels in another room.
Just another small bump in the road
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Winnebago adventurer 37g, 18 F-150
Full time since 2000
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