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I can not attest to lifespan
I have a 2007 model 3000RK mfg date was dec 2006.
Recently my refer/freezer performance was getting worse in the hotter then normal CALIF desert..
Very warm refer and would barely freeze etc..
Removed the roof vent cover and found that some insulation had worked itself loose and was restricting the air flow..
I could not tell this from looking thu the lower access panels up toward the roof vent.
the insulation was packing used against the roof void and refer box sides... I resolved the air flow issue and at that time I also installed a vent fan up near the roof line. Reinstalled the roof top vent cover and can’t be happier.. currently in a 6 week trip with no issues.
Refer stays about 34 and freezer 2 to 4 degrees
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