As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REMOVED VACUUM DRIVE ASSEMBLY AND FOUND DRIVE GEAR SHAFT SEIZED AND (3) TEETH BROKEN OFF OF DRIVE GEAR. FURTHER INSPECTION REVEALED NO LUBRICATION PORT FOR PRESSURIZED ENGINE OIL TO LUBRICATE THE DRIVE GEAR SHAFT. ALL (3) TEETH WER FOUND IN THE OIL PUMP INLET SCREEN. (K)