As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUBMITTER STATED THIS IS THIRD FAILURE EXPERIENCED, TWO PREVIOUS ON RIGHT ENGINE. BOND BETWEEN RUBBER SLEEVE AND ACCESSORY DRIVE GEAR AND ALTERNATOR COUPLE FAILED WITH GEAR SLIPPING RELATIVE TO COUPLE, CAUSED ALTERNATOR TO FAIL UNDER LOAD. (X)