What was found
MCO - FLT 2740 - CLIMBING THROUGH FL110, THE NR 2 ENG OVERHEAT LIGHT ILLUMINATED. ALL OTHER ENGINE INDICATIONS WERE NORMAL. CREW LEVELED FLIGHT OFF AT FL120, THEN ADVISED ATC, RETURNING TO MCO. CAPT PULLED THE NR 1 ENGINE THROTTLE BACK TO IDLE, DECLARED AN EMERGENCY AND AT APPROX 3 MINUTES OUT OF MCO, ON FINAL APPROACH, SHUT DOWN NR 1 ENGINE. FLT LANDED WITHOUT FURTHER INCIDENT. TOTAL SINGLE ENGINE TIME WAS THREE MINUTES. MX FOUND THE TOP NOSE COWL ANTI-ICE DUCT ASSEMLBY WITH A BLOWN FLEXIBLE ASSY. REPLACED DUCT ASSY. OPERATIONAL CHECK AND LEAK CHECK GOOD. (M)