As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT THE CREW DETECTED A STRONG ELECTRICAL BURNING ODOR. TURNED OFF A/C AND FAN AND THE ODOR SEEMED TO DISAPPEAR. LANDED AT DESTINATION WITH NO FURTHER INCIDENT OR ODOR. FOUND FRESH AIR VENT IN THA A/C INSTALLATION TO BE INOPERATIVE. CONCLUDED THE BURNED RELAY COULD HAVE CAUSED THE FAN MOTOR TO HEAT UP AND CAUSE THE ODOR.