Now that I've repaired a few Lionel smoke units, I am not adverse to going into an engine or tender and having a look at the smoke units or speakers or sound cards; they are not that complicated ---- but that's me. I've repaired the smoke unit on my Lionel VL Big Boy with the help of the fellas on this forum - took awhile, went slow, found out that one of the resistors in the dual smoke unit had a beyond spec Ohm reading; ordered parts from Lionel and fixed it. Also, followed laidofsicks videos on smoke units - great help - https://www.youtube.com/watch?v=WRcpFRtA6IY and https://www.youtube.com/watch?v=1asUWbJtfok. In your case, maybe sending it to Lionel for repair is an option.
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