Thanks for your reply. Funnily enough, the TOB (which I assume is what is also referred to as the CRB) was the very first part I had replaced about two years ago when I started having issues. I replaced the original part with a Hill Engineering CRB and at the same time they replaced the clutch position sensor. This did not solve the problem I had at the time (gear selection failures) but it also co-incides exactly with when another problem arose, and that “new” problem is still remaining to this day (the original problem was finally fixed by replacing a solenoid on the F1 power unit). In the meantime I have had a second mechanic look at the CRB install and he said it looks fine, and I even emailed Hill Engineering to see if they thought it was possible that the bearing was faulty, but they said that was extremely unlikely. Long story short I’ve replaced literally every component of the F1 and clutch system in the last two years, except the actual pump. The remaining issue is the “beeping” clutch overheat warning which I get on every take-off once the car is warm, and a very long pump prime as described above. The car actually drives beautifully and gearchanges are crisp and precise. The clutch parameters have been looked at and studied more times than the Dead Sea Scrolls - They are fine. Something else is going on here.