What was found
PIT - FL 1223 - DURING CLIMB-OUT OF PIT AT APPROX 12,9000 FT, THE START VALVE OPEN LIGHT ILLUMINATED ON THE NR 2 ENGINE. CREW FOLLOWED CHECKLIST AND SHUT DOWN THE NR 2 ENGINE. AN EMERGENCY WAS DECLARED AND THE FLIGHT RETURNED TO FIELD AT PIT WHERE IT LANDED WITHOUT FURTHER INCIDENT. TOTAL SINGLE ENGINE TIME WAS 10 MINUTES. MAINTENANCE FOUND THE NR 2 ENGINE NOSE COWL ANTI-ICE DUCT CRACKED. REPLACED DUCT ASSEMBLY AND REPAIRED BURNED WIRES. ALSO, REPLACED ENGINE START VALVE (P/N 2730426). PERFORMED OPERATIONAL CHECK OF ANTI-ICE SYSTEM. OPERATIONAL CHECK NORMAL. (M)