Help Chipmunk Invasion

You better make sure you know your enemy. AFAIK, chipmunks hibernate through the Winter in a ground burrow. The invader may be mice or rats, as they tend to invade closed structures in the Winter and will do just the kind of knawing that you've stated.

If it's fully insured it might be worth checking on a claim after you get a professional estimate.

You, or a dealer, can contact Jayco but I am doubtful that a good wiring diagram is available.

You should check all rubber propane hoses. Chipmunks are attracted to those, ask me how I know.