What was found
CONT CAB ZONE TEMP ILLUMINATES W/ RECALL AND EXTINGUISHES W/ MASTER CAUTION. GROUNDED - YES. VERIFIED ZONE TEMP LIGHT COMES ON DURING RECALL. BITE TESTED BOTH PZTC1+2 IAW B737-800 AMM 21-61-00-700-806-002. LIGHT FOR FLIGHT DECK TRIM VALVE SHOWS ON "BIT, CLEARED ON "VERIFY" FOR PZTC#2. NO OTHER DEFECTS. LIGHT NO LONGER SHOWS ON RECALL. RAN BOTH PACKS INDEPENDENTLY FOR 10-15 MINS EACH. RE RAN BITE CHECK, NO FAULTS FOUND. CLEANED CONT CAB TEMP SENSOR FILTER IAW AMM 21-61-06-100-801.