[mike b]

Hi,
Refridgerator is warm and the freezer seems to be fine. Replaced the defrost heater and the defrost thermostat. Wondering if it is the evaporator fan?

[woodchuck]

Can you verify that the defroster is working. If not try the defrost timer if you don't have the board.
Is vent open between fridge and freezer to allow cold air in.
Yes check the evaporator fan. It should be running when the compressor is running unless it's in defrost mode or door is open etc.