As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER START-UP, THE LEFT ALTERNATOR LIGHT ILLUMINATED. ACFT WAS SHUT DOWN AND INSPECTED. OUTBOARD BEARING OF ALTERNATOR FOUND FAILED. UPON ALTERNATOR REMOVAL, DRIVE HUB (PN 640934) WAS ALSO FOUND FAILED. THIS ALTERNATOR DOES NOT REQUIRE THE 100-HOUR LUBE. THE RIGHT ALTERNATOR BEARING WAS INSPECTED ALSO AND FOUND SERVICEABLE, BUT NOT VERY MUCH GREASE WAS FOUND. BOTH UNITS WERE INSTALLED AT THE SAME TIME.