Brand new 337rls 2020 model purchased in November 2019. Fridge has been working great until last trip, out of the blue. Are the cooling fans in the back of the unit supposed to be heard when they are turning? Have lifted the left door with 2 washers like I've seen people suggest. My thermostatic switch is only at 9 volts or so. Is it always supposed to have 12volts, or just when the fans are running? Circuit board has 13v. I've tried the dollar bill test. It comes out with minimal resistance but not sure how to tighten things up for that.