As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED ALTERNATOR 2 FAILURE FOLLOWED BY STRONG BURNING SMELL IN CABIN. ALTERNATE AIRPORT WAS USED WITH AN EMERGENCY LANDING DECLARED. THE ROOT CAUSE OF THE PROBLEM WAS INTERNAL FAILURE OF ALTERNATOR 2 BEARING CAUSING COMPLETE SEIZURE OF ROTATION. ALTERNATOR 2 DRIVE BELT SLIPPED ALONG DRIVE PULLEY CAUSING EXTREME HEAT BUILDUP WHICH RESULTED IN BELT AND PULLEY FAILURE. BURNING ODOR IN CABIN WAS CAUSED FROM EXCESSIVE FRICTION ALONG BELT AND PULLEY.