The fridge cooling mechanism works essentially the same on propane and electric. In both cases, a heater, called a "boiler" is used to "force" the refrigerant through the system. Sounds like your 120v heating element is fried. You may be able to change it out yourself, as there are several companies that sell the parts. Given the cost of replacing with a NEW fridge, I'd weigh that cost vs the cost of just sticking to propane use. It all depends on how much you use the fridge, and where you camp. More than 50% of my camping is dry-camping, so for me, it wouldn't be worth replacing.....
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