What was found
ENGINE 2 ANTI-ICE DUCT, LEVEL 3 ALERT DISPLAYED ON CLIMB OUT. FOLLOWED VOL 1. DUMPED FUEL, RETURNED TO LAND. NR 2 MANIFOLD FAILED. NR 2 ENGINE SHUT DOWN. INSPECTED A-ICE DUCT FROM 15TH STAGE FORWARD. FOUND NO PHYSICAL DEFECTS IN DUCKING. REPLACED TEMPERATURE SENSOR. REPLACED GCU. REPLACED EPCU. REPLACED RELAYS. REPLACED DUCT FAIL SENSORS. REPLACED ANTI-ICE VALVE. REPLACED TEMPERATURE SENSOR. REPLACED EPCU. REPLACED GCU. REPLACED RELAYS FOR ANTI-ICE VALVE. REPLACED DUCT FAILED SENSORS. REPLACED ANTI-ICE VALVE. ANTI-ICE VALVE AND PRESSURE SWITCH.