I have a vintage 40ft Hy Line ( could be 96 or could be 76 ? ) that i cannot locate any build or vin numbers on. My furnace has packed up, the onsite sparkes came and checked it, and said that the Gas Solenoid was not getting any current. I can find no makers name or numbers on the furnace and am stumped at how to get a new Gas Solenoid fitted, any ideas greatly appreciated