As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER START WITH BOTH ENGINES RUNNING UPON RECALL WE OBSERVED A LEFT PACK LIGHT. THE LIGHT DOES EXTINGUISH WHEN RESET. GROUNDED - YES. REMOVED AND REPLACED L/H TEMP CONTROL VALVE PER B737-800 AMM 21-51-10 OPS CHK GOOD NO LEAKS OR FAULTS NOTED.