What was found
FWD CABIN ZONE TEMP LIGHT, MASTER CAUTION AND AIR COND, 6 PACK, LIGHTS ILLUMINATE ON RECALL. ZONE TEMP LIGHTS EXTINGUISH WHEN MASTER CAUTION IS PUSHED TO RESET. FWD CABIN SUPPLY DUCT TEMP SELECTOR MOVEMENTS. ACFT GROUNDED. PERFORMED BITE TEST OF ZONE TEMP CONTROLLERS, NR 2 ZONE TEMP CONTROLLER SHOWED FAILURE OF TRIM CONTROL VALVE. BITE TEST PERFORMED IAW AMM 21-61-00-700-806-002. R & R FWD PASSENGER COMPARTMENT TRIM AIR MODULATION VALVE REF AMM 21-61-21-000-801 AND 21-61-21-400-801. OPS CK AND BITE CHECK GOOD, NO LEAKS.