1998 Mah3000 Will Not Spin

I have a 1998 Maytag Neptune MAH3000 that will not spin. The washer was completely rebuilt 2 years ago. The washer will go through a complete wash cycle but will not spin. Door Lock light is on and the door locks. Water pump works OK. I have read through quite a few threads but have not found the same syptoms. Any suggestions on where to start before I start taking it apart would be helpful and appreciated. Thank You,
Mike