FGHC2331PFAA Frigidaire Gallery has gone through two inverters in a week

[PiDDiT]

I am a travelling health care worker, and I live full time in a fifth-wheel camper. I have a residential fridge in the camper, and it is plugged in to a self-contained (not running through the breaker board) outlet, that is pulling from a shore power 50Amp plug. Getting repairmen to work on a fridge in a camper is like pulling teeth. They won't or don't want to, probably because of tight spaces. I did find one guy to come out, but not sure I want him to come back. He violated Samurai's Law by guessing at the problem and replacing the inverter as a troubleshooting step, he even told me he was guessing. While the guess was partially right, he didn't solve the problem. He replaced a bad inverter (Panasonic MCBE2UN), original to the fridge, with another converter (EMBRACO VCC3 1156 Q9 F 05), which I have not been able to determine or verify its compatibility with the compressor and/or main control board. It did get the fridge running for a few days. Until it started warming again, yesterday.

So, being the full time RVer that I am, looks like it is on me to fix it. Replacing the fridge is doable, but getting it the fridge out and a ew fridge into the camper would be bonkers hard.

Here's what I've done so far, based on tech sheet troubleshooting, previous posts here, and my own Google research. This was on the inverter which the technician installed: 

• Service is getting power (~128 VAC) to the inverter. Other outlets in the camper are around 120. They are not on the same circuit. Not sure if this is the problem, but keep reading.
• Main control is getting power to the inverter (~11.6 VAC/~4.2 VDC)
• Compressor windings are all ohming out at 9.5
• I am hearing 12 "beeps" every 8-9 minutes...which makes me think the inverter is trying to start the compressor, but can't and is timing out.

So, my biggest question is why did the first inverter go out, and is 128VAC from the power supply enough to cause problems for the inverters? Seems to me that the main control board is fine, since it is putting out just fine. What am I missing? I did go ahead and reorder an original inverter, but I don't want to install it yet since I don't know if I will just be blowing it again in a few days. Please reach out with guidance, more troubleshooting, etc. I am willing to try anything, because I need to be able to fix my stuff if it is going out. I have 3 kids and need to be able to store some food here. Thanks in advance.

PiDDiT