I have a J479 that I recently replaced the thermostat in the large oven but it still does not work. It continues to shut off when it gets to about 200 degrees. Anyone have the parts manual for this model so that I can research what other parts might be the problem? I've been told by my repairman that it could be 2-3 other parts to do with that thermostat but he does not have a parts listing/schematic. I love this range and do not want to part with it or have to replace it if at all possible. Thanks.