As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAGNETO WAS SQUAWKED FOR EXCESSIVE MAG DROP ON RUN-UP. NOTED UNUSUAL INDICATIONS ON MAG TIMING INDICATOR LIGHTS. PULLED MAG AND DISASSEMBLED. FOUND BEARING CAP ASSY (M3485) LOOSE. THE POINTS MOUNT TO THIS CAP. THE ENTIRE INSIDE OF THE MAG WAS COVERED IN BLACK SOOT, THE DISTRIBUTOR BLOCK, DISTRIBUTOR GEAR, AND POINTS WERE ALL DESTROYED.