As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OPERATOR REPORTS LOW CHARGE VOLTAGE AT LOW ENGINE RPM. RAN AIRCRAFT AND VERIFIED LOW VOLTAGE. REMOVED COWL AND DISCOVERED ALTERNATOR CASE TIE BOLTS LOOSE ALLOWING THE CASE HALVES TO SHIFT. UPON REMOVAL OF THE ALTERNATOR WE DISCOVERED THAT THE LOCK TABS INSTALLED ON THE TIE BOLTS WERE ALSO LOOSE. THIS IS THE SECOND SUCH INCIDENT WHERE THESE BOLTS AND LOCK TABS WERE LOOSE.