I have a Jennair duel fuel range which will not hold the set oven temperature. I have replaced the temperature sensor and the door gasket with no change. When you set the temperature the oven will reach the temperature although it seems to take a long time and after baking for 10 minutes or so if you cancel and re enter the temperature the oven will have dropped 50 degrees or so? Any suggestions? Is this a control board issue? I don't see the boards listed for this oven.