The AC and DC heater elements are usually located in tubes welded to the sides of the chimney tube of the propane
burner heater. They look like long upside down J 's with the wires coming out the J to the circuit board, under a plastic cover. If you remove the plastic cover and find the two wires, you can usually just pull out the two wires as they are on push-on terminals. Then you can see if that is really the GFI tripping short. If the element is the problem, then it is a job of replacing the element. Looking on eBay for RV Fridge elements, you can see what they look like. Now the problem! The chimney is wrapped with fiberglass insulation, then wrapped with a metal sleeve. The sleeve is one piece but split and hooked with tabs, in my case, at three places. IF, you have the room, and are very flexible, you MIGHT be able to get in there and open the sleeve, open the fiberglass matt and be able to slide the element UP and out, and then replace it! It WILL be hard to get started to remove, twisting required due to rust. IF the fridge is small and easily removed into the Scamp
, then that's the way to do it. Of course that means disconnecting the propane
SO, the answer to your question, can it be done? YES, but it ain't easy, and due to the labor involved would be pricey for an RV shop to do.
I replaced the whole cooling unit in my 2 door Dometic RM2607 following several YouTube videos, which would be a good reference for you to check if you want to get that intimate with your fridge. Check out YouTube by searching for Dometic cooling units, or Norcold if that's your fridge and see what and how the rear of the fridges are assembled.
Good luck and report what you find and do.