Great info!
My CS80, serial number 1449, had this problem. I had it serviced by my tech in 2006 who had a hard time finding the cause. He didn't have access to SB 096 so he had to find out himself, and he did.
I bought this CS80 from a professional musician and I never understood how he could even have played on this instrument. This bug made it impossible to play on it, imo.
My other CS80, SN 1589, seems to have had the same problem according the SB, but I guess someone has taken action in the past.
