I agree that it looks more like an adhesive issue, but treat it like water damage until you're 100% sure. I would remove as much as possible so I could make a verification there is no moisture. If there is, than there is a leak to find.
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Cut it 3 times and it's still too short...
2017 Sandpiper 381RBOK
2006 Ram 3500 Cummins Dually
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