I been there. Found the opeators manual (has a diagram (not scematic) of the water system. Nothing on the electric, as far as a schematic.
I am about to make a change in the hotwater line. From the factory, water heater in the very left rear of the motorhome (uner the master bath cabinet. Hot water runs out to the forward (half-bath) about 18 ft. away to a header feeding the 1/2 bath sink and the kitchen sink, then another line heading back to a header under that rear bath sink with lines to the washer, sink and shower. Why, in the world did run that hot water line to the front and then back to the rear. Big waste of water everytime we want hot water back there.
I have access to the lines under the shower pan so I am going to cut and make connections for the hot water there, closing off the line coming from the front making the path about 25 ft. shorter for hot water in the rear.
I'll use Ts and valves so I can return it to stock routing if need be.
2010 WBGO Vista 32k - sold/traded
2014 Tiffin Allegro 36LA