Long story short, I think I blew out the main seat as a results of exposing the LPG gas line to line pressures over 15psi.
What happend was the system was clogged with dog hair and dust after 3 years of sitting in the fireplace. The pilot wasn't allowing any gas to go through. I made the rookie mistake of blowing out the unit with the air compressor. Yes it now flows like a mother, but it also allows the main burner to light up with the pilot. Consequently the Lo/High does not funtion either. Its WIDE OPEN all the time. Quite scary.
Without having to replace the entire control, is it possible to replace the internal component that failed? If so, who can I pick this up from? I called SIT and they said Johnstone sells the "guts" yet the Johnstone website only shows the entire control itself...errr.