Have you tried the internet?
I believe Behmor's site has a video or used to on how to replace the motor. it's not too hard to do, there are a few clips or so. I replaced one on my very first behmor. See if there is a reset for the code first, try resetting it and then starting it see if it comes back, so you know for sure it's the motor and not just a burp. His website should list the directions to do this. I think they may be slightly different between the old school ones and the newer ones so make sure you look at the right one.
How old is the Behmor? how many roasts you run thru it? If you did several hundred roasts then it might be time to move on from that one. Also, if it's a few years old and been rode hard the quartz heating lamps may be ready for a replacement too. I think they get weaker after a while so as long as you are in there tinkering, might want to think about that too.
Aaron