As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PART ENGINE START, ON RECALL CONT CAB ZONE TEMP ILLUMINATED. RESET WITH MASTER CAUTION. GROUNDED - YES. CONTROLLER BITE CHECK RESULTED IN TCV FAULT, LH SIDE. REMOVED AND REPLACED LH TEMPERATURE CONTROL VALVE IAW B737-900 AMM 21-51-10-000-801 AND AMM 21-51-10-400-801, ETOPS GROUND FUNCTIONAL CHECK GOOD IAW AMM 21-51-00-700-803.