As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PIC REPORTED A METAL GRINDING NOISE AT SECOND ATTEMPT TO START AIRCRAFT. FURTHER INVESTIGATION FOUND STARTER TOOTH MISSING AND TOOTH DRIVE CRACKED AND BROKEN IN SEVERAL SPOTS. RING GEAR FOUND MISSING TOOTH AND SEVERAL OTHER TEETH WE RE CHIPPED. ALL PARTS (STARTER AND RING GEAR) REPLACED WITH SERVICEABLE PARTS. AIRCRAFT RETURNED TO SERVICE.