My Norcold N512 was doing the same thing. Made no difference if on shore power or gas. Cooling fins never got below 50 degrees on the coldest setting, so a fan would not have helped. Dealer checked the venting and replaced the cooling unit to no avail. Finally Norcold agreed there was an issue with the unit and had it replaced this spring with new and all seems to work well now. Was just a long road to get it replaced. Wish I knew what ailed the defective unit so I could help you out.
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