What was found
JFK - DURING CRUISE, NR 1 NACELLE FIRE DETECTOR FAULT LIGHT ILLUMINATED WITH TEMPERATURES IN THE FAULT RANGE. THEN NR 1 ENGINE FIREWARNING SOUNDED. SHUTDOWN NR 1 ENGINE AND DISCHARGED BOTH EXTINGUISHER BOTTLES. FOUND BOTH DETECTORS SHORTED. REPLACED BOTH DETECTORS, MFG P/N 60B00023163 AND P/N 60B00023166. PERFORMED POWER RUNUP AND NACELLE DETECTOR FAULT AND FIREWARNING SYSTEMS CHECKED NORMAL.