As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REPLACE LEFT TCV DUE TO RECENT HISTORY OF LEFT PACK LIGHT. ACFT GROUNDED. REMOVED AND REPLACED THE LT TEMPERATURE CONTROL VALVE IAW AMM 21-51-10-000-801, AND 21-51-10-400-801. ACCOMPLISHED LT TEMP CONTROL VALVE INSTALLATION TEST, NO LEAKS OR FAULTS NOTED.