[jwetering]

Yeah....its not possible to see what you've got without pulling the gearbox.

Good news though is that the clutch can fail without warning. Common failure mode is a collapsed spring plate, that's what happened to me. This happened without a hint of slipping, although pedal effort had increased.

If you're lucky the clutch will fail soon and all will be revealed. You'll either replace the bearing, or sleep peacefully knowing your big nut bearing isn't likely to fail...plus you'll have a new clutch.

Best case scenario really.