I have campagnolo freehub but it is less than one year old switch from shimano to campy late last year so i am thinking the bearings in it are fine.
Cycleops ceramic bearings.
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If the hub bearings feel rough you must send the hub back to cycleops for new bearings.
Search there are plenty of powertap bearing issues just on this forum.
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With most other hubs you can replace the bearings at home provided you have your own bearing press.
I had a new sl hub that would eat bearings every 300 miles.
The reason you cannot replace powertap bearings is that the hub needs to be recalibrated after new bearings are pressed in.