I have a Reznor model# SSC250-6-s-MV. It has two burner compartment and only one will light. It uses a Johnson Controls G67BG-5. I've only swithed to the commercial side of the trade four months ago so I'm green. How do I troubleshoot the control? I do have 24volts to it. At the unit there are two spare pilot burners. Thanks for any help.