As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON 08/05/2012 WHILE EN ROUTE FROM OGG TO KOA, THE PILOT SMELLED AN ELECTRICAL SMELL (BUT NO SMOKE) COMING FROM BEHIND THE CIRCUIT BREAKER PANEL. THE PILOT TRIPPED OFF THE GENERATOR AND SWITCHED OFF THE STANDBY POWER AND CONTINUED THE FLIGHT ON BATTERY POWER. THE SMELL QUICKLY DISSIPATED. UPON EXAMINATION, THE ALTERNATOR CONTROL UNIT WAS FOUND TO BE THE PROBLEM, IT HAD SMOKE DAMAGE AND WHITE ASH LOOKING RESIDUE ON IT.