The small pcb in the fridge roof is just a small variable rheostat, The pcb is on the back of the appliance and it is made by beko in Turkey. Parts are available from Glen Dimplex ( stoves,newworld ) in Prescot. Check your email for the bulletin when they changed from manual stats to display
once you get the gdha part, get a jotter notepad and make a note of every beko branded gdha spare you use, and then use that code in the future, the gdha spares markup is ridiculous considering they dont even repackage most of the beko spares, instead just putting a label over it.