I took my 620 into the shop because it was losing clutch fluid and I had to keep bleeding the lines and topping it off. They replaced the entire master cylinder and said that should fix the problem. It ran fine for 4 weeks (200 miles or so) then all of sudden the clutch lost all compression and was low on fluid again. I took it back in and they can't find any leaks or reasons for it to be low on fluid. They topped it off, bled the lines again, and said if it happens again I'll just need to replace the slave cylinder. Is that a natural conclusion, would a bad slave cylinder cause this? Can't you just look at a slave cylnder and tell if it needs to be replaced?