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Hello, greetings, fellow repair enthusiasts. I haven't been here in many years because I've managed to keep the homestead running on very simple tech, with grand old antique appliances which rarely break down, and when they do, I know what to do to fix them. But the neighbor brought me a GE GTS17DTNJRWW top freezer fridge which is less than 1.5 years old and quit cooling soon after it was out of warranty. I typically turn old fridge cabinets into raised planter boxes, but when I began to disassemble this one I was enamored with how clean and new it is, yet simple and basic by design. I noticed that both fans and the interior light operate, but the compressor doesn't seem to audibly turn on, even though there is a slight vibration coming from it. Hard to tell with the fan blowing at it though. I thought I heard the start relay clicking and turning off the compressor after a minute. There was a rattle sound when I handled the compressor start relay combo device so I bought a new start relay and capacitor to play with it. I pressed the door switch 3 times in case the control board needed resetting and it also sat unplugged for a few days. When I turned it on with the new relay/capacitor, I measured 0.4 amps AC going into the start relay. The fridge cools, but only to about 40 degrees inside the freezer compartment, after 20 hours of non-stop operation. I looked at the helpful repair flowchart here on the website, but I don't know how to answer the compressor operating question. It does not make a typical compressor start noise like all the other electric fridges I've ever had. A lot of negative customer reviews on GE's website mention how noisy their compressor sounds, but this one doesn't make a sound. I don't know how to test the control board for faulty function, and due to the cost of the control board I don't want to take a gamble on buying a new one if I don't know if the compressor is any good or not. Can anyone advise me on how to test the compressor for basic operational functionality? How would I know if the compressor is bad versus the control board being faulty?