As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE, THE FLIGHT CREW SENSED A SMOKE ODOR IN THE COCKPIT. THE FLIGHT ENGINEER NOTICED THE NUMBER THREE DC LOAD MONITOR WAS READING AN EXCESSIVE LOAD. THE NUMBER THREE TRANSFORMER RECTIFIER CIRCUIT BREAKER WAS OPENED AND THE ODOR SUBSIDED. MAINTENANCE INVESTIGATED AND FOUND THE TRANSFORMER RECTIFIER DEFECTIVE. MAINTENANCE DEFERRED THE NUMBER THREE TRANSFORMER RECTIFIER.