As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE RIGHT PACK ZONE TEMP CONTROL UNCONTROLLABLE. EXCESSIVE HEAT IN CABIN. PERFORMED AN EMERGENCY LANDING WITHOUT FURTHER INCIDENT. REMOVED AND REPLACED AFT ZONE TRIM VALVE RIGHT PACK IAW AMM 21-61-21. LEAK CHECK GOOD, OPERATIONS CHECK GOOD, BITE CHECK GOOD. AFT CABIN CONTROL TO FULL COLD, NO DEFECTS NOTED. CABIN COOLED DOWN, NO EXCESSIVE HEAT PRESENT. THE AIRCRAFT WAS GROUNDED.