As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT AFTER TAKEOFF RECEIVED A BLEED 1 OVERHEAT MESSAGE ON THE EICAS. CREW FOLLOWED THE QUICK REFERENCE HANDBOOK AND RETURNED TO KMKE. THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE FAN AIR VALVE THERMOSTAT. OPERATIONAL CHECKS WERE GOOD WITH NO FURTHER DEFECTS NOTED AT THAT TIME.