Troubleshooting Control Bd Msg - Now What?

I have a Kenmore bottom-freezer refrigerator. Model #: 596.75522400.
Recently replaced compressor and the Control Board Kit (Jazz) – part #12002339.

Freezer keeping ice frozen. Refrigerator warm.

Control board troubleshooting Service Test #1 indicates that “Defrost Thermostat Shorted (closed).”

Now what? Do I need a new control board? Is the Control Board controlling all of these systems? Or is there a separate Defrost Thermostat that can be replaced?

Thanks for your help.

I have the same question!