As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BRONZE CENTER BUSHING IN DISTRIBUTOR BLOCK IS LOOSE IN THE PLASTIC ALLOWING THE ROTOR ARM TO MAKE CONTACT WITH THE DISTRIBUTOR BLOCK. SECOND OCCURRANCE OF THIS HAPPENING TO THIS SERIES MAGNETO. OTHER OCCURANCE HAPPENED TO A MAGNETO VERY CLOSE IN SN TO THIS ONE.