As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) SHORTLY AFTER TAKEOFF THE ENGINE BEGAN TO RUN ROUGH AND LOSE POWER. AIRCRAFT RETURNED TO BASE. RUN UP THE FOLLOWING DAY REVEALED THE LEFT MAGNETO WAS DEAD. DISASSEMBLY OF THE MAGNETO REVEALED BROKEN TEETH ON THE DISTRIBUTOR GEARS.