I got the blank doc as well. Guess it is true - silence can speak volume.
But for our listening to TP music purposes, 25/91 has no impact and the last official Studer firmware release 01/88 (from first week of 1988) for A810 is still good. As I understand it, the 25/91 has mainly bug fixes for TLS 4000 interface functions that studios use mostly.
Ki