As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON RUNUP BEFORE FLIGHT MAG CHECK CARRIED OUT. ENGINE WOULD NOT RUN WHEN SELECTED TO RT MAG. REMOVED RT MAG, FOUND 50 PERCENT OF TEETH ON MAIN TIMING GEAR TO BE STRIPPED OFF. RT MAG REPLACED WITH SERVICEABLE MAG. (TC NR 20070511010)