B11GNS

I keep getting this, i got it before and the whole pedal is vibrating and if you grab hold of the clutch release arm you can feel the same, seems its coming from inside the bellhousing. I removed the box last time and found the release bearing broken up so replaced it all including new bearing and it was fine for a while but the vibration has slowly been coming back and its back to as worse as it was last time. Anyone any ideas?