Cimplexsound, i'm glad you figured out the problem. But i'm still confused. Is the water heater on the same side of the coach, below or next to the refrigerator? I would sure think its access panel would be visible in the OP's photos. Or was the water traveling across from the other side of the coach?
03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E