What was found
DURING RECALL, THE CONTROLLER CABIN ZONE TEMP LIGHT STAYED ON. IT WENT OUT WHEN RESET. ACFT GROUNDED. CONFIRMED CONTROLLER CAB ZONE TEMP ANNUNCIATOR ILLUMINATED WITH MASTER CAUTION RECALL AND EXTINGUISHES WITH RESET. PERFORMED CABIN TEMP CONTROLLER BITE ON BOTH ZONE/TEMP CONTROLLERS, REF AMM 21-61-00, FOUND NR 2 CONTROLLER WITH FLT DECK ZONE TRIM VALVE RED FAULT LIGHT ON. CONTINUED WITH BITE TEST AND FAULT CLEARED. BOTH CONTROLLERS, OPS NORMAL. COCKPIT CONTROLLER CABIN ZONE TEMP ANNUNCIATOR REMAINS EXTINGUISHED WITH MASTER CAUTION RECALL.