As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONTROL CABIN ZONE TEMP LIGHT ILLUMINATES DURING RECALL. THE ZONE TEMP LIGHT EXTINGUISHED ON MASTER CAUTION RESET. ACFT GROUNDED. CONFIRMED FAULT, THE NR 2 PACK/ZONE TEMP CONTROLLER BITE IAW AMM 21-61-00-700-806-002, SHOWS HARD FAIL FLIGHT DECK TCV V143. REPLACED THE TCV AMM 21-61-21, OPS CHECKED NORMAL. NR 1 PACK/ZONE TEMP CONTROLLER SHOWS NO FAULTS.