I've just been playing with my new Layout, I'm running a new Zephyr DCC start set with approx 80ft of track covering a 10'x8' area. I'm running an Athearn sd40 Digitrax DCC, A bachmann gp38 DCC onboard, and a sw7 Cow dc, all running beautifully at the same time. My question is about the bachmann-I just picked it up and I was trying to change its factory "03" address to the loco's own number-my zephyr keeps giving me a "d nd" error but there is no problem programming my sd40 Digitrax address. Is it possible to change the bachmann dcc decoder address on my Zephyr unit?