Try the oldest trick in the book, take the logic board out of the running elevator and put the bad logic board in running elevator. Sounds like you e2 is scrambled.
If the eprom doesn't clear it will not teach...or it will teach too many floors etc. I have had MRS steppers work after taking out the eprom and re-installing them.
Gamma D are notorious for volatile ram problems. I have had the selector/position tape with a magnet on the lowest landing just off a little cause this also.