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When you defrosted it, did you test the heater and defrost sensor?
You can measure for continuity but the thermostat must be cold to test accurately. It is best to test those parts because there is no real definitive test for the electronic control. If both of those mechanical parts test good, process of elimination would suggest the control is faulty.
The control, which I suspect it likely to be the faulty part, is mounted behind the part where you press to adjust temperatures. It is where the display is and it controls every function in the refrigerator.
Actually, on that model, it is mounted down by the compressor, number 35 at the link below.