As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND ALTERNATOR HOUSING CRACKED AT THE FRONT MOUNTING ARM. AFTER INSPECTING LIKE AIRCRAFT, FOUND A SECOND ALTERNATOR CRACKED IN THE SAME LOCATION. THE SUSPECT CAUSE FOR THE CRACK IS INCORRECT SHIMMING OF THE ALTERNATOR TO THE MOUNT. SUBMITTER STATED CLOSE ATTENTION NEEDS TO BE GIVEN TO THE CORRECT SHIMMING OF THE ALTERNATOR WHEN IT IS INSTALLED.