As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON RECALL, MASTER WARNING, A/C - ANNUNCIATOR AND LT LIGHT CAME ON. ALL EXTINGUISHED UPON RESET. PERFORMED BITE TEST OF LT PACK ZONE TEMP CONTROLLER REF AMM 21-61-00-700-806-002. VERIFIED FAULT, FOUND FAULTED LT PACK TCV. REPLACED LT PACK TEMP CONTROL VALVE. OPS AND LEAK CHECKS GOOD NO FAULTS ON BITE TEST AFTER MX.