What was found
AFTER PASSING 11,000 FT, RECEIVED A LEVEL 3, NR 1 ENGINE FIRE WARNING. FOLLOWED QRH, AND SHUTDOWN THE NR 1 ENGINE. UNEVENTFUL LANDING. REMOVED AND REPLACED BRACKET AND HP COOLING RECOUP Y DUCT IAW EM 72-00-00, PERFORMED A HIGH POWER RUN IAW JRH AND LEAK CHECKED NORMAL. ACFT OK FOR SERVICE.