As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRESS MSTR RECALL GET ZONE TEMP ON CONT CAB AFTER START USED QRD AND CONTACTED MTC. GROUNDED - YES. PERFORMED BITE PROCEDURE FOR PACK/ZONE TEMP CONTROLLER PER B737-900 FIM 21-62 TASK 801. BIT AND PREV FLT ANNUNCIATORS SHOWED FLIGHT DECK TCV INOP. PER TECH SERVICES AND DUE TO HISTORY REMOVED AND REPLACED CONTOL CABIN TRIM AIR MODULATING VALVE PER B737-900 AMM 21-61-21. OPS CHECK AND LEAK CHECK GOOD. ETOPS GROUND VERIFICATION SUCCESFUL.