I finally was able to get my rig out of storage so I could work on it.
I think I have learned a lot about how it is wired, but I'm afraid I have not solved my problem yet.
Here is the update as I understand it:
I learned that the Breaker Box is actually 2 in 1 with a main panel on the left and the right side acts as a sub-panel. The sub-panel circuits all work off of the inverter.
Based on discussions on other recent threads, I was surprised that the Inverter powers everything but the Air Conditioners and Fireplace.
1. Since all other things work, I will assume the Inverter is NOT the problem.
2. I measure 120V on the Refer Breaker, so I assume there is no problem with wiring 'into' the panel or the breaker itself.
3. It looks to me like the issue IS between the breaker and the outlet behind the fridge.
Am I overlooking something?