As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ANNUAL INSPECTION, FOUND FORWARD ALTERNATOR HOUSING BROKEN AT PIVOT BOLT EAR. INSPECTED INSTALLATION AND DETERMINED BELT TENSION TOO TIGHT. LYCOMING SI 1129A PERTAINS TO THIS SUBJECT. PROPER BELT TENSION IS PARTICULARLY CRITICAL ON LYCOMING ENGINES.