As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER START, RECEIVED A ZONE TEMP LIGHT FOR THE COCKPIT, RAN CHECKLIST, STILL HAD THE LIGHT ON RECALL, EXTINGUISHED WITH MASTER CAUTION RESET. ACFT GROUNDED. PERFORMED ZONE TEMP CONTROLLER NR 1 AND 2 BITE CHECK. FOUND TCV FAULT ON NR 1 CONTROLLER. R & R THE TEMPERATURE CONTROL VALVE NR 1 IAW AMM 21-51-10-401. OPS CHECKED GOOD. NO FAULTS.