As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 6006, CVG TO MKE, DURING CLIMB IN ICING CONDITIONS THE FLIGHT CREW RECEIVED AN E1 BLEED OVERTEMP WARNING ON EICAS. THE QRH WAS FOLLOWED AND THE AIRCRAFT RETURNED TO CVG AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE NR 1 FAN AIR VALVE FILTER AND THE NR 1 FAN AIR THERMOSTAT AND THE BLEED SYSTEM OPERATED NORMALLY.