Hello, pool and tech-savvy friends. I need advice on diagnosing a spark issue I am having with my pool heater. I have a Raypak P-R406A-EP-C pool heater. The unit is about 8 yrs. old. My unit is the Atmospheric Heater with the Honeywell Millivolt Gas Valve (Model VR8304K4822) and the RobertShaw...