I agree, gunrunerJohn! It would be customer service. Wish I could answer that question. And, thanks for uploading the graphics for me.
So, based on the info. It suggests removing all of the existing boards (tender photos attached) .
So if I remove all existing boards, and then put in the new ERR board (attach the speaker, chuff) how do I connect from the tender to the command board (locomotive)?
Not sure how to "remote the two plug-in boards and wire the ERR board to the pins where the sound board plugs in."