This is a frost free freezer with a wet wall fridge 50/50. Fridge is ok but freezer is chilling but not freezing. There was only 1 replacable therostat in the freezer which is on a plug along with defrost heater and fan connections. The other stat was hard wired coming through rear entry along with gas pipes. Just would like to know what stat to change to get freezer down in temperature? Cheers