Norcold refrigerator another story

My brother-in-law last summer had his refrigerator quit on them. he had a whole new one put in. It worked about a month and quit cooling, it was still under warranty. But all Norcold would replace was the cooling unit. So he had that changed out. It still didn't cool good. The repair told him it was not getting enough air in the vent. So he had the guy cut a larger vent space in the side of the coach, put a larger vent door plus put in a another 12 volt fan just above the new vent door. . He now says that thing cools just as good as a residential refrigerator. They are full timers. I'm thinking I may try that.
What do you guys think??