As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START ON GROUND CONT CAB ZONE TEMP LIGHT ILLUMINATED UPON RECALL. LIGHT CANCELS WITH MASTER CAUTION RESET PER QRH PROCEDURE. PERFORMED FIM TASK 21-62-00-810-842 CONTROL CABIN ZONE TEMP LIGHT ON AND STAY OFF AFTER RESET. CONFIRMED FAULT TCV FAULT ON NR 2 CONTROLLER. REPLACED ZONE TRIM AIR MODULATING VALVE NR 143 PER MM 21-61-21-000-801. OPS CHECKED GOOD.