As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COMPLYING WITH SLICK 500 HR INSPECTION ON LEFT MAGNETO P/N 4371, S/N 19020681 AND RIGHT MAGNETO P/N 4371, S/N 19020682 ALL IMPULSE COUPLING RIVETS FAILED INSPECTION (LOOSE RIVETS). IT WAS THE FIRST 500 HR INSPECTION AND SERIAL NUMBERS OUTSIDE OF SB2-19.