As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED RECEIVING A BLD 2 OVERTEMP AND A BLD 1 UNDERTEMP INDICATION ON THE EICAS. MAINTENANCE REMOVED AND REPLACED THE NR 2 FAN AIR VALVE THERMOSTAT AND PERFORMED AN OPERATIONAL CHECK OF THE NR 1 AND NR 2 BLEED SYSTEMS WITH NO DEFECTS NOTED.