My main oven overheats during the preheat period when baking. Example: if I set the oven to 370, the oven will beep at 370 after 16 minutes, but my digital thermometer will be at 507 degrees. Eventually the oven will cool down to 380 degrees (after another 25 minutes has elapsed) and then fluctuate between 380 and 404 degrees. I replaced the temperature probe and nothing changed. So I think its the main relay board. Anyone know the detailed directions for replacing the board? Is it accessed from the front panel where the burner controls are? Or is it done by removing the side panel of the range? Thanks