Kenmore slide in natural gas range model number 911. 7 1988 13 serial number 9 G 24566 I am having an issue with a set knob not working it will not control the LED display at all of my change numbers temperatures anything therefore I can't use my oven I'm wondering if it's just an issue or if I'm looking at a control board issue. hopefully its something as simple as taking off and cleaning it was electrical contact cleaner. also the gas valve is freezing up has to be tapped open the gas supply.