On 02/10 I had an engine that would run under transformer control with no sounds or lights. I did not check the couplers.
on 02/11 I installed a new Rayovac 9v NiMH battery and had full caps, lights sounds, all DCS functions. Ran the unit for An hour forward, and an hour backwards. Shut the layout down, had the mystery sounds and the dead battery.
Make sense?