I have the same TT and looked at that wiring long enough ago that I do not have a clear memory. But you're right, some of those wires are accessible from the back (outside) fridge area. But I think there's more access from the outside "kitchen" compartment. Take out the little fridge. The back wall and/or the right side wall come out with just a couple screws. There might be more accessibility going through there.
By the way, when you replace the oem spray foam, use closed cell foam. You shouldn't get a water spray in the outside fridge area, but just in case you do, use closed cell.
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