Greg:
If you haven't already done so, you might climb up on the roof and check the sealant around this vent. It may not be sealed properly and needs repairing. Before applying any additional sealant, I would thoroughly clean off the entire area to ensure a good bond. Be sure to use a cleaner and sealant that is compatible with your EPDM rubber roof. Dicor white self-leveling lap sealant (501LSW) would be a good product to use.
After it has dried properly, test by spraying it with water.
You might also look for cracks in the metal base while you are checking it.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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