For sure, the maintenance of the clips is mainly suspect of the mechanical side, but one point is really important for the electric. If there are any damages of the magnets, e.g. cracks, missing magnets or massive edge chippings, the whole magnet system needs to be replaced. Otherwise it is possible that during a clip collision parts of the magnets fell out, be squeezed in the air gap between motor and magnet system and destroy the cover of the linear motor.