Looking at the plans, is there a register like vent in the bedroom wall next to the shower? That may allow you to look under the shower. My Adventurer has that and also an access panel at the base of the shower right in front of the shower door. Winnebago is usually really good at providing access to that area. Wish I could help more, but thought I’d send my thoughts since I don’t see other replies. Hopefully, someone with your model will weigh in.
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2023 Newmar Bay Star 3014, towing 2014 Honda CRV
2017 Winnebago Adventurer 35P
2013 Itasca Sunstar 26HE
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