As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REPORTED ODOR OF SMOKE IN FLIGHT DECK AND ELECTED TO DIV INTO LHR. EMERGENCY WAS DECLARED AND SMOKE, FUMES QRH PROCEDURES WAS ACCOMPLISHED. CREW PULLED MASKS OUT BUT DID NOT DON THE OXYGEN MASKS. MTC FOUND HIGH VOLTAGE CONNECTION HARDWARE AT L1 WINDOW LOOSE AND BURNED. REPLACED WINDOW, J5 WIRING, HARDWARE AND WINDOW HEAT CONTROLLER.