Agree with ChicagoTOm to not try to repair on your own. Since your unit is old I would be concerned about the seals, heaters, and electrical controls. If you are up for getting the fridge done as part of a trip, I highly recommend National RV Refrigeration. I would see if they have a scratch and dent unit in stock. I was going to travel there to have them install one but I found a new unit close to home.
https://fixyourfridge.com