While still at Lake Keowee I could determine that the source of the leak was somewhere near the electrode for the electric function of heating the water (we have a combination Gas/Electric water heater that allows us to select either method of heating the water, whichever is most advantageous at any given time.) However, as you can imagine in a coach of our size, space is limited and access to installed utilities is tight, if not nonexistent.
The only way to diagnose and remedy the problem was to fully uninstall the water heater from its "cubby" to find the source of the leak. After a day or two to reflect upon how mad I was about the procedure I had to undertake, finally on Sunday, January 26th, I extracted the device.
Removal left a gaping hole in the side of our rig.
Peering out of the hole, there's the water heater in all of her aluminum glory.
You can see the water that had leaked from inside.
We nearly destroyed the styrofoam insulation surrounding the water heater in the process of removal.
Preparing for pressure testing to find the source of the leak.
After pressure testing with water, we could see a pinhole leak on a weld where the heater had been previously repaired. If you look very closely, you can see a very faint but strongly pressurized stream of water spewing from the center of the blue highlighted circle.
On Friday, January 31st, I was able to reinstall the mended water heater and perform the necessary tests to ensure proper function. It took nearly a week, but we are now back in business with a dry water heater compartment and the ability to take hot showers!