As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP ILLUMINATES ON RECALL. GROUNDED-YES. PER B737-800 FIM 21-62 TASK 801 AND 833. PERFORMED PACK TEMP CONTROL BITE. CONTROLLER 2 SHOWED FLIGHT DECK TRIM VALVE FAULT IN ACTIVE AND HISTORY. REMOVED AND REPLACED FLIGHT DECK TRIM VALVE, V143 (ZONE TRIM AIR MODULATING VALVE), IAW B737-800 AMM 21-61-21. LEAK CHECK GOOD. OPERATIONS CHECK GOOD. PACK TEMP CONTROL BITE NO FAULTS. REPAIR CONFIRMATION SUCCESSFUL.