I have a Kitchen Aid Superba Mod #KEMC307KSS05, SERIAL # XT0702305 -- it does not heat up. The display works, but after setting it, it just says Lo and stays that way. I cannot hear a fan go on either. I did have a repairman look at it a while ago and he tried to replace the thermal fuse in the front and said that did not work and told me I would have to replace the whole control panel and it was going to cost about $550. I am trying to do a little research to see what else I can try first. It sounds like maybe try the thermal fuse in the back of the oven and a new blower? Any ideas here to help save me $100s would be greatly appreciated? Thank you. :)