Had a power outage last night for a bout 4 hours. Now the panel of our 8-year-old GE range PB975STSS seems to work but neither the cooktop not the two ovens heat up. The lights inside the ovens work when you open the doors. Does it mean that the main board is fried? If so, how expensive might the repair be? A GE technician is coming Monday morning and they'll charge $100 just for the visit. If the repair will be hundreds of $s, maybe we'd be better off buying a new oven? I can try to fix it myself but one complicating factor is that the oven sits very tight between countertop pieces so I am not sure I can move it out by myself. So is there much I can do -- at least diagnose -- working from the front? Thx!