What was found
CAB ZONE LIGHT ILLUMINATES ON RECALL AND EXTINGUISHES ON MASTER CAUTION RESET. ACFT GROUNDED. PACK/ZONE TEMP CONTROLLER BITE IAW FIM 21-61, TASK 801, SHOWED FLIGHT DECK TRIM VALVE FAULT ON NR 2 ZTC BUT VERIFY TEST PASSED WITH NO FAULTS. FOUND FLIGHT DECK TEMP SENSOR AND FILTER DIRTY. CLEANED SENSOR AND CLEANED FILTER IAW MM 21-61-06-100-801. PERFORMED CABIN TEMPERATURE CONTROL AND INDICATION. OPS TEST IAW MM 21-61-00-700-807-002 AND PACK/ ZONE TEMP CONTROLLER BITE IAW FIM 21-62 TASK 801. ALL TESTS PASS.