As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN HEATER CIRCUIT BREAKER POPPED DURING HEATER OPERATION WHILE AIRCRAFT WAS IN FLIGHT. UPON LANDING MAINTENANCE PERFORMED INSPECTION/TROUBLESHOOTING OF HEATER SYSTEM MALFUNCTION AND FOUND HEATER FUEL PUMP HOUSING BURNED THROUGH DUE TO POSSIBLE INTERNAL DEFECT.