I have a Kenmore brand, cooktop with either a preasure regulator or gas valve problem. The Model number is JGP336AEV. When I turn any control knob to the light position, I can hear the sparker or igniter clicking but there is no gas flowing. I thought it might be one of the gas valves but there is no gas flow to any of the four gas burners. Range is gas operated and it is still working fine so I know it's not a gas issue. I can only assume that the regulator has failed or cloged up. Any help out there? Thanks. Ken:)