I had changed the defrost heater and evaporator fan two years ago which worked great. Now fridge and freezer would just get too warm randomly and I noticed the evaporator fan was not running but compressor was running. Did some tests on the mainboard and saw the Evap fan and defrost heater and all thermistors were testing fine. So I figured its probably the mainboard!!! Plug and play swap and the fridge is working great so far.