As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LT ENGINE WOULD NOT START OR EVEN COUGH. THE MAGNETO TIMING WAS CHECKED AND IT WAS FOUND THAT THE IMPULSE COUPLING ON THE LT MAGNETO WAS CAUSING THE MAGNETO TO FIRE BEFORE TOP DEAD CENTER. THE LT MAGNETO IS THE ONLY IMPULSE COUPLED MAGNETO ON THIS ENGINE. THIS CAUSED THE ENGINE TO NOT START. THE MAGNETO WAS NOT OPENED SINCE IT WAS STILL UNDER WARRANTY AND THAT WOULD VOID THE WARRANTY. THE TIME ON THIS MAGNETO SINCE NEW IS 88.8 HOURS.