What was found
ON PUSHBACK RECALL CONT CABIN ZONE TEMP ILLUMINATED. GROUNDED - YES. PERFORMED PZTC BITE IAW B737-800 FIM 21-62 TASK 801 FOR BOTH PZTCS. FLT DECK TRIM VALVE FAULT LIGHT ON BIT/PREV LEG, CLEAR AND RESETS ON VERIFY FOR NR 2 PZTC. NO FAULTS ON PZTC 1. RAN BOTH PACKS FOR MIN 15-20 MINS AT VARIOUS SETTINGS, NO FAULTS. PERFORMED FLT DECK TEMP SENSOR FILTER AND SENSOR CLEANING, REF B737-800 AMM TASK 21-61-10-100-801 AND TASK 21-61-06-000-801.