Have you been through standing water that could have splashed up? Or sprayed a hose in a upward direction on the front grill?
I have a Vegas 25.2 and have had my hoses off to get to the battery and have not experienced any water. Possibly condensation from air conditioner if something is not put together properly. You can see where the hoses hookup to the unit through the access hole under the desk, or possibly through the wheel well on the passenger side.
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