I have a safety valve and gas thermostat, as well as 2 thermocouples.
Does it work on gas at all? Do the freezer or refer compartment get cool? The reason I ask these questions is that the first thing to determine is if the Ammonia system is intact, if not you will be throwing money out the window. Once the cooling unit goes the unit is best sent to the dump. Do you have an ammonia smell in the refer or freezer compartment?
Here is a link to the dometic manuals, you may want to try some of the troublreshooting steps, If the parts I have can help, let me know. The freight is what is going to cost $$$, the parts are yours if you need them.
Dometic service manuals