[Richard]

First figure out EXACTLY where the water originates. I find blue paper shop towels invaluable as any water that touches them turns the area dark blue.

Water migrates easily so exit points under the coach may mislead you. Let me provide an example. I was sure I had fresh water running out of my Aquahot once, since water was running out of the exhaust access port for the AH. Nope, it was the rotating seal on the 120V water pump, all the way on the other side of the coach.