As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON RECALL, LEFT PACK LIGHT ILLUMINATES, RESET WITH MASTER CAUTION. PERFORMED BITE TEST OF THE LEFT PACK & RIGHT PACK ZONE TEMP CONTROLLERS PER 21-61-00-700-806-002. FOUND LEFT PACK TEMP CONTROL VALVE TO BE INOPERATIVE. REPLACED LEFT PACK TEMP CONTROL VALVE PER AMM 21-10-400-801. PERFORMED INST TEST PER 21-51-10-400-801 & OPS CHECKED GOOD.