What was found
NR 2 ENGINE ANTI-ICE DUCT (ALERT) ON IN FLIGHT COMPLIED WITH EMERGENCY PROCEDURE AND SECURED NR 2 ENGINE. DIVERT TO SUITABLE AIRPORT. AIRCRAFT LANDED IN SHANNON IRELAND AFTER DUMPING FUEL TO BE BELOW MAX LANDING WEIGHT. FOUND WITH ALL ENGINES AND APU SYSTEMS STATIC, ALERT WOULD SHOW INTERMITTENTLY SUSPECT THERMAL SWITCH 51.1081. DEFERRED NR 2 ANTI-ICE VALVE COWL INOPERATIVE. REPLACED THERMAL SWITCH AND CLOSED MEL AT A-CHECK. (M)