As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB TEMP CONTROL (ZONE TEMP) LIGHT ILLUMINATED AFTER PUSHPACK. RAN QRH. LOWERED TEMP PER QRH. LIGHT EXTINGUISHED. GROUNDED - YES. CONTROLLER IN E & E FAULTED WITH CONTROL CABIN TRIM VALVE FAULT. REMOVED AND REPLACED CONTROL CABIN TRIM MODULATING VALVE IAW B737-800 AMM 21-61-21-000-801 AND AMM 21-61-21-400-801, ETOPS GROUND FUNCTIONAL CHECK GOOD IAW AMM 21-61-00-700-002, SEAMC MITCH NOTIFIED OF ETOPS MAINTENANCE.