As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CRUISE, PROP DEICE WAS SELECTED ON AND AC GEN 1 AND 2 CAUTION LIGHTS ILLUMINATED WITH ASSOCIATED LOSS OF AC POWER. QRH PROCEDURE WAS CARRIED OUT AND AC POWER WAS RESTORED TO NORMAL. INVESTIGATION REVEALED NR 1 BRUSH BLOCK WAS WORN BEYOND LIMITS AND THERE WAS EVIDENCE OF ARCING BETWEEN THE BRUSHES. THE NR 1 SLIP RING WAS CLEANED AND INSPECTED SERVICEABLE. REPLACED THE NR 1 BRUSH BLOCK AND TESTED THE SYSTEM SERVICEABLE. THE AIRCRAFT WAS SUBSEQUENTLY RELEASED TO SERVICE.