sorry for the delay, I was on tour today and had to search a little bit for the papers. I did a fast scan of the relevant pages of the service manual and loaded it up for you now: http://www.radbasteln.de/dynadrive_service.pdf (approx 3 MB)
Hope this helps. I did it a few years ago and it wasn't a great issue. Good Luck. Let me know when you received the file so I can delete it from server for minimal server load.
best regards, Richard