Got it. I guess it must of just failed. I am using TMCC with an old ZW. I've not used Aux 9. I tested the track voltage and it maxes out at 17V. I assume all is ok in this area.
I don't have the tech acumen that gunrunnerjohn has, but I likely can remove and replace the R2LC and the Fan Unit PCB along with putting new smoke unit resistor and the wick material in the smoke unit. Should I order the parts from Lionel directly? Better option?