As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALTERNATOR DRIVE COUPLING IS VIBRATION DAMPED BY RUBBER BONDED TO SHAFT AND OUTER HOUSING. RUBBER SEPARATED FROM OUTER HOUSING. SECOND FAILURE ON THIS TYPE AIRCRAFT SERVICED BY THIS AGENCY IN LAST 12 MONTHS. PART IS ALSO VERY EXPENSIVE. SUGGEST GOING BACK TO PREVIOUS DESIGN USING DRIVE BLOCKS LIKE MAGNETO DRIVES.