As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LEFT ENGINE FAILED TO START. MECHANIC REMOVED AND REPLACED STARTER CLUTCH. ON INSPECTION OF REMOVED STARTER CLUTCH, MECHANIC FOUND DRIVE GEAR TOOTH SHEARED. RECOVERED SINGLE TOOTH FROM OIL PUMP. RETURNED AIRCRAFT TO SERVICE AFTER FURTHER INSPECTION OF ACCESSORY GEARS. CLUTCH TO BE RETURNED TO MANUFACTURER FOR FURTHER EVALUATION.