Well my reliable handyman brother told me he fixed his fridge, as he had same problem. Freezer working but fridge warm. He suggested I order Defrost Heater Kit. I looked it up on your website and found part but noticed Defrost Thermostat as well. So I ordered both. Anyhow he installed the thermostat only. Fridge is cooling. We did not install Defrost Heater Kit. Gonna see if we even need to? So far so good with just the thermostat. We'll be watching to see if back wall freezes up again.