I've just noticed some fairly significant clutch slipping when accelerating hard in 6th. I'm fairly sure the clutch isn't worn out - I suspect the input seal on the clutch slave might be leaking and contaminating the clutch - I replaced that slave unit not long ago. Can anyone give me any pointers on how to discern whether that is the cause without breaking the bike in half to get at the clutch? Or suggestions what else to look into?