As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) 5 MINUTES AFTER TAKEOFF, THE RIGHT GENERATOR WENT OFF-LINE. THE AIRCRAFT RETURNED TO POINT OF DEPARTURE. MAINTENANCE DETERMINED THAT THE STARTER/GENERATOR BRUSHES HAD CRACKED AND THE LEADS HAD SEPARATED FROM THE REMAINING BRUSH MATERIAL.