I wish i had been around on first shift when they were further diagnosing this issue. Apparently they got the spindle to start temporarily, and the brushes were so worn that the rivets were touching. I missed a pretty good light show.
Anyhow, Fanuc doesn't make parts for this perticular drive anymore, so we have to send it out to get custom made. At least i'm not paying for it, as we're probably doubling the machines value by replacing the brushes.
Anopther concern arose, however, when the first shift operator put the machine in edit mode and powered down, as the memory was cleared and all programs were lost. Guess we'll cross that issue when the spindle turns.