I only operate my N&W Warhorse J (1996 6-18049) with TMCC so decided to remove the two year old battery from the tender. Sounds were working properly before battery removal. Now I get start up and chuff sounds but when I try the whistle it works for an instant followed by a "bark" of static and then silence. The start up or chuff sound returns as normal after 2-3 seconds. Attempting to activate brake squeal and shut down sounds produce the same result as whistle. I can get the bell to work if I quickly tap the button.
I then tried a fresh battery with the same results. Removed battery again, unplugged wires from the circuit board, tested all for continuity, and re-attached. No difference. Next I tried a factory reset using Code 74 and also Code 4 but neither helped.
I tried my spare tender and it works fine so I don't think the issue is in the engine. BTW, I was wearing an anti-static strap while working on the tender. Is there anything else I can try?