What was found
ZONE TEMP LIGHT ILLUMINATED. EXTINGUISHED ON RESET AND ILLUMINATED AGAIN ON RECALL. QRH COMPLETED. GROUNDED - YES. PERFORMED PACK TEMPERATURE CONTROL - BITE PROCEDURE REF B737-800 FIM 21-62 TASK 801. TEST INDICATED FLIGHT DECK TRIM VALVE FAULT ON # 2 PZTC. PERFORMED FIM 21-62 TASK 831 AND FAULT RESET. PER FIM NO FURTHER ACTION NECESSARY. ETOPS GROUND VERIFICATION TEST GOOD. OK FOR SERVICE. RECALL INDICATED NO FAULTS.