As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)DURING CRUISE, THE #1 ENGINE REDUCTION GERABOX CHIP DETECTOR LIGHT ILLUMINATED AND THE ENGINE WAS SHUT DOWN AS A PRECAUTION. MAINTENANCE INVESTIGATION REVEALED THAT THE DRIVE TEETH ON THE STARTER WERE WORN OUT. THE DRIVE WAS REPLACED AND THE OIL SYSTEM FLUSHED.