As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2966, FLIGHT CREW REPORTED PACK NR 2 OVERTEMP AND BLEED 1 AND 2 OVERTEMP INDICATIONS ON EICAS. CREW PERFORMED AIR RETURN AND LANDED ACFT UNEVENTFULLY. MX REMOVED AND REPLACED FAN AIR THERMOSTAT AND PERFORMED OPS CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.