For a few years I called around and had fridge generalists come to address the issue of my sub-zero fridge not holding the set temperature. I finally found out about Kampen Appliance after a trades person told me over the phone "If I can't fix it I will call Kampen"
Well I called them myself. Chris diagnosed the problems and recommended a full replacement of the system parts. Winston installed it in less an hour. I was happy with their honesty and professionalism. I would recommend that you call them if you have an issue with your Sub-Zero or Wolf product. Do not pay twice like me.