As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAGNETO COIL HIGH TENSION TAB WAS BENT TOO FAR UPWARDS DURING MANUFACTURING, TO THE POINT THAT THE TAB WAS CONTACTING THE DISTRIBUTOR BLOCK GEAR. AS A RESULT, A LARGE DIVOT WAS WORN INTO THE COIL TAB DUE TO THE ROTATION OF THE GEAR CONTACTING THE COIL TAB DURING IT'S ROTATION.