As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED THAT AN ELECTRIC PROPELLER DEICE BOOT FAILED DURING FLIGHT. VISUAL INDICATIONS OF A BRIGHT ORB EMANATING FROM DEICE BOOT ARC AREA WAS PROFOUND ENOUGH FOR THE PILOT TO DECLARE AN EMERGENCY AND RETURN TO LAND AS SOON AS POSSIBLE. MAINTENANCE DETERMINED THAT A PROP DEICE BOOT WAS DEFECTIVE AND HAD APPARENTLY SHORTED OUT THUS CAUSING THE ORB LIKE DISPLAY.