GP 40 will not program was running fine

[clutch]

MR Bach Man or anyone can help.
I have a GP 40 DCC Santa Fe that came out of set #00501 Digital Commander.
The loco was running fine DCC and it just quit. You can't get it to de- program or program on any address. the other Locos (DCC) run fine on this command center. The GP40 will run on an analog layout. I bought the set 3/5/07 at Hobby Lobby so it's still under warrenty. I have sent service requests to the Bachmann service center a couple of times with no responce.
If any one has any suggestions on how to get it back up would be welcome. My be something simple I would like to fix it myself and save the trouble of sending it to service.
Thanks
Clutch

[WoundedBear]

Phone Bachmann service....I had a similar problem and they sent out a new decoder lickety spit.

Ask for Tom in parts.