As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON RECALL PRIOR TO DESCENT THE LEFT PACK LIGHT ILLUMINATED, WHEN MASTER CAUTION IS RESET LIGHT EXTINGUISHES. GROUNDED - YES. PERFORMED PZTC BITE PROCEDURE REF FIM 21-62 TASK 801 ON LT PZTC. PREV FLIGHT LOGGED TCV VALVE FAULT. REMOVED AND REPLACED LT PACK TCV VALVE REF AMM 21-51-10-400-801 LEAK CHECK GOOD. RAN BOTH PACKS AT HOT AND COLD FOR 5 MINUTES. PERFORMED PZTC BITE PROCEDURE AGAIN REF FIM 21-62 TASK 801, NO FAULTS FOUND.