What was found
ZONE TEMP ILLUMINATED ON RECALL LIGHT EXTINGUISHES ON MASTER CAUTION RESET. ACFT GROUNDED. ACCOMPLISHED ZONE TEMP CONTROLLER BITE ON BOTH CONTROLLERS IAW AMM 21-61-00, ZONE TEMP CONTROLLER NR 2 FAULTED "FLT DECK TRIM VALVE", CLEANED FLT DECK SENSOR AND FILTER, RETESTED ZONE TEMP CONTROLLER NR 2 TWO MORE TIMES AND FAULT DID NOT COME BACK, ZONE TEMP DOES NOT ILLUMINATE ON RECALL, GROUND VERIFICATION SUCCESSFUL.