As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK ANNUNCIATOR, ILLUMINATED ON MASTER CAUTION RECALL. EXTINGUISHES WITH MASTER CAUTION RESET. ACFT GROUNDED. PERFORMED PACK/ZONE TEMP CONTROLLER BITE IAW MM 21-61-00-700-606-002. NR 1 CONTROLLER FAULTED TEMP CONTROL VALVE. REMOVED TEMPERATURE CONTROL VALVE IAW MM 21-51-10-000-801. INSTALLED TEMP CONTROL VALVE IAW MM 21-51-10-400-801. PERFORMED TEMP CONTROL VALVE INSTALLATION TEST IAW MM 21-51-10-400-801. INSTALLATION TEST IS GOOD.