Did you replace the defrost thermostat,AP3796802, a small, round device clipped to the evaporator coils.

Ninety percent of the time, that's your problem, second is the defrost heater.
You can confirm by temporarily shorting the wires to the thermostat, then force defrost with a jumper to the power connector on the motherboard.
Unplug fridg, remove the 3 pin power connector and note which pins go to the pc board pins def. and line. Put a jumper between the mating pins on the connector, then plug in the fridg, should now defrost

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could you please walk me thru what to do to test the defrost heater just to be sure im doing it right?