As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INVESTIGATION FOR ALTERNATOR DRIVE COUPLING RETAINER FAILURE FOUND DRIVE COUPLING BUSHING TO BE AN INCORRECT PART. BUSHING PN 626543 WAS INSTALLED. PN 632050 IS PROPER PART. 812 HOURS TT SINCE INSTALLATION. SUBMITTER STATES RUBBER BUSHINGS SHOULD BE CHECKED IF ENGINE HAS 500 HOURS OR MORE TT.