Sorry I can't help, but I have exactly the same problem and would love any advice. All I can tell you is that the fats freeze button doesn't create the same loud(ish) sound as before and my fan doesn't seem to be working, but I'm not sure if it's the fan - I replaced the thermostat when it initially went down and I'm pretty sure that's not the issue. Help! :)
Jezz, January 2016