As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE MAGNETO COIL CRACKED ITS OUTER CASING. THERE DID NOT SEEM TO BE ANY EVIDENCE OF ABUSE, BUT THE LEFT MAGNETO ON THE SAME ENGINE FAILED BY CRACKING ALSO, AND, IT ONLY HAD 180 HOURS TIME IN SERVICE, AN ADDITIONAL MALFUNCTION AND DEFECT REPORT WILL BE FILED FOR IT. SUBMITTER RECOMMENDS ACTUALLY REMOVING COILS FROM THE MAGNETOS DURING ANY 100-HOUR OR ANNUAL INSPECTION TO DETECT CRACKS ON THE BOTTOM OF THE COILS.