As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED TO MAINTENANCE THAT ENGING NR1 START HOT. MAINTENANCE CREW INVESTIGATE AND DURING ENGINE RUN NR1 DC GENERATOR CAUTION LIGHT ILLUMINATE. THEY REPLACED THE NR1 DC STARTER/GEN AND AFTER VISUAL INSPECTION ON THE UNSERVICEABLE PARTS THEY FOUND THAT THE REAR BEARING WAS DISINTEGRATED/