As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) NR 1 ENGINE GENERATOR AND CONSTANT SPEED DRIVE (CSD) WENT FULL VOLTS AND FREQUENCY. THE GENERATOR WAS TURNED OFF. VIBRATION WAS NOTICED, SO THE CSD WAS DISCONNECTED. A SEAL ON THE GEARBOX WAS FOUND NICKED. THE ENGINE WAS REPLACED.