As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT AND DURING RECALL GOT LEFT PACK LIGHT AND DURING MASTER RECALL IT RESET THE LIGHT EXTINGUISHED. GROUNDED - YES. PERFORMED PACK TEMP. CONTROL BITE TEST IAW B737-800 FIM 21-62 TASK 801. FOUND TEMP CONTROL VALVE FAULT WAS INTERMITTENT DURING PREVIOUS FLIGHT. FAULT CLEARED AFTER PUSHING "VERIFY" SWITCH ON THE CONTROLLER. AIRCRAFT OK FOR SERVICE.