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Hi I'm John I will help you with the freezer problem.
You said the board was replaced were any parts in the freezer checked ?
I did not check any of the parts in the freezer. After reading about the product recall for the main board, as installed in other models, I falsely concluded that was my problem. Also, for a few days before the refrig failed at 30 deg F, the fan speed in the freezer compartment changed from normal to a lower level as if it was being turned on and off. That problem stopped with the fan running at normal speed and never turning off. Changing the main board did not change the fan function...it runs continuously.
The number 240 in the breakdown is the defrost thermostat could be open stopping the current from getting to the defrost heater number 230, the number 240 is usually the problem.
You need a meter to check that part to make sure its failed.
The heater element, no 230, is burned out...open..it only reads leakage or insulation resistance many megohms. I will replace the heater and run the system before I change the thermostat unless you recommend changing the thermostat when I replace the heater.