As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) IN FLIGHT, THE FO EXPERIENCED A NR 2 WINDOW OVERHEAT (WINDOW WAS HOT TO TOUCH) WITH NO ASSOCIATED WARNING LIGHTS. DUE TO WEATHER LIMITATIONS AT THE ARRIVAL AIRPORT THE CREW PERFORMED AN AIR TURN BACK. THE WINDOW HEAT CONTROL UNIT WAS REPLACED AND THE AIRCRAFT RETURNED TO SERVICE.