I'm having problems with my Kenmore electric range/oven. The burners work correctly and the time comes on the display, however the Oven On light stays lit. Also, when I turn the knob for the oven, I no longer see the set temperature for the oven. The bottom burner doesn't come on, just the top one for broiling. I have been keeping it unplugged just in case, but not having an oven is becoming a major inconvenience. I checked for a serial number but there isn't a label on the back for one. Any help would be great!! Thanks. :)