My fridge has starting having temperature control issues. It will freeze up and then the defaust cycle will kick in and melt everything. Its like a thermostat is bad or a control board is bad.

A repair person from another state told me to replace all the system boards, there are three. Seems like shooting in the dark.

Anyone with suggestions on what component may be the culprit?

Any advise would be appreciated, hard finding some to work on Viking in my town.

Nelson