Hello all I have a Norcold 624 in my 63 safari. I never got it to light on gas caust the saftey valve was leaking and I don't think i left it on 120 V long enought to cool down, I have read here it can take up to 24 hrs??? to cool down??? Anyways does anyone have any tech. info on this reefer aka how to check elec. switch that comes on when you switch from gas to elec., or how to test thermostat and heating element? Any help here would be greatly appreciated.