Having no idea of the source, I removed the vent cover under the bath to insure that it was not the

problem.  We mopped it up with some paper towel, (it was really not that bad), and hoped that it was

a spill from the pups' water dish.

Next day it was back.

I remembered that the fresh water bib was not in a very accessible location for that particular site, and that

we had just enough hose to make it from the bib to the R-Pod.

Turns out that we had over-strained water hook-up hose, and the torque from the stretched hose

had created a minuscule drip at the input.  I have tightened the connection, hooked up to a good water

source, and verified that there is no longer a drip.

To do so required removing the mattress from the rear bunk, unscrewing the piece of plywood that

gave access to the plumbing, unscrewing the "City Water" input connector, tightening, re-installing, etc.

Oh yes, and buying a longer potable water hose!