What was found
ON RECALL THE CONTROLLER CABIN ZONE TEMP LIGHT ILLUMINATES ALONG WITH THE MASTER CAUTION AN AIR CONDITION ANNUNCIATOR. ACFT GROUNDED. PERFORMED BITE TEST OF BOTH PACK/ZONE TEMP CONTROLLERS, REF AMM 21-61-00. RT CONTROLLER FAULTED FLIGHT DECK TRIM MODULATING VALVE. FAULT CLEARED, R & R FLIGHT DECK TRIM AIR VALVE, REF AMM 21-61-21. OPS CK, BITE CK, & LEAK CK GOOD.