As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, AN ELECTRICAL FUME FOLLOWED BY A PUFF OF SMOKE EMITTED FROM THE FLIGHT DECK. AIRCRAFT DECLARED AN EMERGENCY, RETURNED AND LANDED WITHOUT INCIDENT. REPLACED WINDOW HEAT CONTROLLER, TERMINAL BLOCK HARDWARE AND CLEANED UPPER WINDOW ELECTRICAL CONNECTOR. OPERATIONL CHECKS GOOD.