you can try to rebuild the motor but 9 times out of 10 the armature is generally trashed and would also have to be replaced, the expense of this is almost the cost of a new motor.

You can try to resurface the armature commentator but you will find after a short period of time the 'clicking' will return even under normal operation and cause drive error codes relating to open drive circuits because the brushes will start jumping off the bars again.

If you take a closer look at these sections that are raised you will find they correspond to where the brushes are related to their positions around the brush housing. This 'raised com bar' scenario is caused by stalling the motor usually. The com bars get hot, the resin that holds them together gets soft, the bars raise up from the centrifugal force being applied when the armature is turning. Once this happens there is no 'fix' for this, it will continue to happen until the com bars just short out or come apart.

using a seating brush or resurfacing stone or even rebuilding the motor and cutting the armature com bar surface down may temporarily fix this problem but the 'real fix' is to just replace the armature or complete motor.