As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS - FOUND CAB TEMP MAINTANENCE MSG. PERFORMED SYSTEM TEST OF ECS IAW AMM 21-53-00 FAULTED PACK 1 HEAT EXCH TEMP SENSOR (521HH7) REMOVED AND REPLACED SENSOR (521HH7) PER TSM 21-53-00 OPS CHECK GOOD MESSAGE CLEARED A/C OK TO CONTINUE