Sometimes Bachmann "Dcc on Board" locos will return a "DnD" error to the Digitrax Zephyr when attempting to change the factory default decoder address from 3 to something else.

Digitrax support suggests wiring a 12 V bulb across the rails of the programming track. That is, one lead to one rail, the other lead to the other rail. Then, proceed in the normal manner to read and program the decoder's address. I tried it and it worked like a charm!

How do I take this puppy apart, and what do I need to disconnect and reconnect when I'm in? I have a Digitrax decoder. The loco is an older model (B&O) I acquired on ebay from a man who had moved up to brass equipment. The Bacjmann name is embossed on the bottom between the drivers. Any help would be appreciated. Thanks!