I have had two different Jayco dealer service departments do the winterizing on my 2016 Eagle fifth wheel, and each time after dewinterizing, I had leaks. I have the residential Frigidair refrigerator and the manual says only winterize it using the air method, but the dealers have used antifreeze.
I'm going to do it myself and use air, so this discussion was very helpful. I think what happens is water gets trapped between the valves, so I will try cycling them in all the options.
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