As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RESISTOR HAD OVERHEATED CAUSING HEAT DAMAGE TO THE CASE AND PC BOARD. THE DECAL ON THE OUTSIDE OF THE CASE WAS DISCOLORED. ACCORDING TO THE AIRCRAFT RECORDS, THE LAST ELT OF THIS TYPE WAS ALSO REPLACED BECAUSE OF INTERNAL HEAT DAMAGE. SUBMITT ER STATED A DIFFERENT RESISTOR SHOULD BE USED.