I purchased a '07 Norge, knowing that it was making some gnarly noises. Thought it was clutch, but clutch just showed glazing, not mangling. (A close friend who is retired from being the bestest Guzzi tech alive is doing the work for me). then he opened up the rear end and found the pinion nut had backed off. Nooooooo!! Unsure if the bearings are all replaceable, so I found and purchased a used unit. I'll have him put that one on. the question is, are the bearings replaceable, or is it a non-serviceable unit?