JW Webster - AS near as I can find, there is a thermostat on the heater tube and one on the blower housing. No others. The one on the blower housing has only two wires connected to it (as does the one on the heater tube). It is listed on repair clinic as the cycling thermostat. I will try changing that one.
As for replacing the solonoids, I did not as there were new ones on the valve assembly.