As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LT ENG MAGNETO CHECK GOOD ON RUN-UP PRIOR TO TAKEOFF. ON CLIMB OUT, LT ENG BEGAN RUNNING ROUGH. MX FOUND LT ENG RT MAGNETO INOPERATIVE. FURTHER INSP REVEALED DISTRIBUTOR DRIVE GEAR TEETH STRIPPED. MX REMOVED AND REPLACED AFFECTED MAGNETO. AS A PRECAUTIONARY MEASURE, THE RT MAGNETO AND SPARK PLUGS WERE REPLACED ALSO. GROUND RUN CHECKED GOOD, RELEASED BACK TO SERVICE.