As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS REPORTED ALTERNATOR NR 2 INOPERATIVE WITH ASSOCIATED CAS WARNING MESSAGE. TROUBLESHOOTING BY MAINTENANCE REVEALED HIGH RESISTANCE OF THE FIELD CIRCUIT OF THE ALTERNATOR WHEN ROTATED, SEEMED ACCEPTABLE WHEN STATIC. PERFORMED FULL FIELD CHECK OF ALTERNATOR AND IT WAS STILL INOPERATIVE. ALTERNATOR WAS REPLACED WITH SERVICEABLE UNIT, WHICH THEN FUNCTIONAL CHECKED WAS GOOD.