You have a mold issue...clean those spots off and apply a mix of water and bleach..
I’d also be looking inside all cabinets and closets...if you don’t stop this now you will have more issues... and black mold can cause all sorts of respiratory issues
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2007 GMC Classic club cab 4x4 Duramax LBZ
2014 Alpine 3010 RE. 34 foot fifth wheel
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