As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ZONE TEMP LIGHT FOR CONT CABIN ON MASTER RECALL. GROUNDED - YES. PERFORMED B737-800 FIM 21-62 TASK 801 PACK TEMP CONTROL BITE PROCEDURE. ON THE RIGHT PZTC FOUND FAULT PACK/ZN CON-L FLT DECK TRIM VALVE. PERFORMED FIM 21-62 TASK 833 CIRCUIT BREAKER RESET PROCEDURE. OPERATIONAL TEST NORMAL.