What was found
CONT CAB ZONE TEMP LIGHT ILLUMINATES ON RECALL AND EXTINGUISHES ON MASTER CAUTION RESET. GROUNDED - YES. CONT CAB ZONE TEMP LT ON WITH MASTER RECALL AT OVERHEAD. PERFORMED PZTC BITE IAW B737-800 FIM 21-62 TASK 801. NR 1 LT PZTC NO FAULTS. NR 2 RT PZTC, FLT DECK TRIM VALVE ON BIT, TCV ON VERIFY. PERFORMED FLT DECK TEMP BULB CLEANING IAW AMM 21-61-10-100-801. NOTED FILTER AND BULB BOTH VERY DUSTY. PERFORMED CABIN CONT INDICATION OPS TEST IAW AMM 21-61-00-700-807-002. ALL INDICATIONS NORMAL. WENT FULL COLD/WARM/COLD. ALL TEMPS RESPONDED AS APPROPRIATE IN ALL ZONES. RE RAN PZTC BITE, NO FAULTS #1 OR #2, BOTH GREEN ON VERIFY. LT EXTINGUISHED FROM MASTER RECALL.