As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IMPULSE COUPLING FOUND TO BE CRACKED AT ADVANCE STOP NOTCHES OF BASE PLATE. DEFECT WAS DISCOVERED USING MAGNETIC PARTICLE INSPECTION OF PART DURING PERFORMANCE OF MFG RECOMMENDED-500 HOUR INSPECTION. BOTH MAGS ON THIS ENGINE SHOW SAME DEFECT.