As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CABIN COMPARTMENT SHOWS 7D EVENT THOUGH AFT CABIN TEMPERATURE CONTROLLER IS SET TO WARM DURING CRUISE FLIGHT(<P>PERFORMED BITE CHECK ON DECK SYSTEM IAW FIM. REMOVED AND REPLACED LEFT PACK TEMP CTRL VALVE IAW AMM 21-51-12. OPS CK GOOD AT THIS TIME.</P>)