As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ILLUMINATED WITH RECALL. LIGHT EXTINGUISED WITH MASTER CAUTION RESET. ACFT GROUNDED. PERFORMED A LEFT PACK CABIN TEMP CONTROLLER BITE TEST IAW AMM 21-61-00. FOUND TCV TO BE INOPERATIVE. REMOVED AND REPLACED THE LEFT PACK TEMPERATURE CONTROL VALVE IAW AMM 21-51-10. BITE TESTED, OPS AND LEAK CHECKED GOOD.