As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, PILOT INTERMITTENTLY SMELLED SMOKE IN THE AFT CABIN AREA WITH PASSENGERS ONBOARD. THE RIGHT WINDSHIELD DEFOG THEN BECAME INOPERATIVE, AND WAS SUBSEQUENTLY DEFERRED UPON LANDING. NO EMERGENCY WAS DECLARED. DURING MAINTENANCE TROUBLESHOOTING, THE WINDSHIELD DEFOG RELAY BOX WAS FOUND TO HAVE A HEAVY BURNED SMELL WITH VISIBLE SIGNS OF OVERHEATING. THE WINDSHIELD DEFOG RELAY BOX WAS REPLACED WITH NO FURTHER DISCREPANCIES NOTED.