As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAGNETO FOUND TO HAVE A LOOSE IMPULSE COUPLING STOP PIN. THERE IS A SERVICE BULLETIN SB1-19A THAT ADDRESSES THIS BUT IT IS FOR SERIAL NUMBER MAGNETOS OLDER THAN SN#18050664 . THIS IS OUTSIDE OF THAT GROUP AND THE PROBLEM SHOULD HAVE BEEN CORRECT BY THIS SN#.