As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT PACK LIGHT COMES ON. EXTINGUISHES WITH MASTER CAUTION RESET. ACFT GROUNDED. PERFORMED PACK ZONE TEMP CONTROL BITE IAW AMM 21-61-00-700-806-002. RT PACK TCV IS A HARD FAULT. REMOVED AND REPLACED THE RT PACK TEMP CONTROL VALVE IAW AMM 21-51-10-000-801, AND AMM 21-51-10-400-801. PERFORMED INSTALLATION GROUND VERIFICATION TEST PER SAME AMM. GROUND VERIFICATION TEST IS GOOD.