I was able to buy some service manuals from a radio repair shop in Austria which, unfortunately, ceased business. There was a little hope that it contains all pages inclusive chapter 9 (modifications). Unfortunately chapter 9 was missing and I really think it was never written.
It seems there is no documentation available for the changes, so the PCBs often contain components which are not in the circuit schemas.
Also ordered two versions of the built in CD mechanics, the C.D.M.2. When I get a little time I will scan the documents and upload them.
