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FWIW, this is a Richard hack when working on unknown circuitry.

First I would get to good wiring on both sides of the burned and chewed stuff. Then I make jumpers with a blade fuse holder in the jumper. Any automotive store will have the blade fuse holders. A 5 or 10 amp blade fuse will protect the circuits from a direct short.

So to clarify.  Put blade fuses on the burned and chewed wires??  I have the blade fuse holders already in my tool box in the coach

That is probably not a bad idea. This is where lever nuts come in handy to temporarily connect things for testing. I do not think you need to keep them in the circuit but at least to test for the first time it would be a good idea. I was trying to see if I could identify what those wires go to but they are not shown on the schematic. Keep in mind, some of the Wanderlodge guys told me that you can send that control box back to HWh and they will refurbish it. They said that they can also just supply a replacement, however at a cost and that may not be available now, not sure.