I was having a similar problem with my four door norcold unit. But the refrigerator part was not cooling after outside temps reached 90 or above. So I go to put a fan at the top vent and what did I find ? The factory had put a piece of plywood that was blocking 2/3 s of the vent. Out with the plywood and found 2 fans below it one not working because of a mud dobbers nest. Cleaned it , fan starting working . Refrigerator works perfectly now.
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