As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ILLUMINATED ON DESCENT LIGHT EXTINGUISHED W MASTER CAUTION RESET. GROUNDED - YES. PERFORMED BITE CHECK ON #1 ZONE TEMP CONT, CONFIRMED HARD FAULT ON TCV. REPLACED LH PACK TCV PER B737-900 AMM 21-51-10, GREEN "GO" LIGHT ILLUMINATED.