i didnt have the slave on for that long at all (maybe two weeks and it would never shift) ...the TOB should whine if its going out. i hear the same noises that you hear. without the clutch pedal pushed in and the car at idle in N ...you didnt hear any noise. push in the clutch pedal and you hear the hoise. :shrug:
i hope he doesnt have the same problems but it sounds like it.