A cooling unit failure at 4 yrs old is indeed quite rare..... are you sure the cooling unit has failed? Did you have a tech inspect it? The refrig opening should be inspected to ensure the baffling and ventilation is correct for your unit. The control circuitry should also be inspected.
It is entirely possible something else has caused the unit to fail - simply replacing the cooling unit may result in the same failure happening again.
If it has failed and everything else mentioned above is ok and you want to try it yourself there are several videos on youtube to guide you along the way - Dometic or Norcold the procedure is essentially the same. Removing the unit and getting it to the floor and re-installing it is the easy part - The hardest part of the process is separating the cooling unit and properly installing the new one, and of course sealing it up well.
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94-Newmar Kountry Star 40-KSDP
Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified
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