DeWalt 733 planer died today

I bought it new in 1997 and used it off and on for the first 17 years but in the last 3 I have used it a lot, sometimes daily. It has always run fine but today I turned it on and it ran for 1/2 a second then quit. Here's what I know:

1) It is getting power, I even switched to different circuit altogether
2) I pulled the switch out to verify that it is good
3) The brushes, though original, are still 1/2" long and show no signs of chipping or abnormal wear
4) The wires on the brushes are intact and the springs have plenty of tension
5) The motor is easy to spins (took the side covers off to verify)
6) The 18 amp built-in breaker on the top of the motor is in the position it should be in
7) In shining a light onto the commutator I see no chips or bridged arcs between segments

I don't really want to spend the money on a new planer and would rather get this one running again. I can order new brushes just to rule that out but again, the current ones look fine to me.

Ideas?

David