Hi again,
It turned out that the BC8000 did not have a “TR9” issue – my issue was also a little different. It could Play, REW and stop by command but when selecting FF it stayed in FF eventhough pushing Stop. Measuring around on board 4 showed correct electrical signals. It turned out that the FF solenoide was half stuck staying in outer position. Lubricating the rod inside solved the issue.
Finally everything works 🙂
/Pindsen