What was found
WHILE PERFORMING T/C #05-020-01, #1 ENG HAS FAULT CODE 73-41992 FUEL COOLED OIL COOLER (FCOC) DELTA PRESSURE SENSOR IS OUT OF RANGE, ENG 1 EEC C2, PRESENT IN SMT. GROUNDED - YES. MAINTENANCE MESSAGE 73-41992 IS LATCHED ON # 1 ENGINE. PERFORMED RESISTANCE CHECKS FOR HEAT EXCHANGER DELTA PRESSURE SENSOR REF B737-9 IFIM G73-31-00-810-806. RESISTANCE MEASUREMENTS ARE OUT OF LIMITS. PER SAME TASK, REMOVED AND REPLACED MAIN FUEL/OIL HEAT EXCHANGER DELTA PRESSURE SENSOR REF B737-9 AMM 73-11-12/401. PERFORMED POWER PLANT TEST # 32, ENGINE IDLE SYSTEM TEST REF AMM 71-00-00-700-808-G00. OPS CHECK AND LEAK CHECK GOOD. MAINTENANCE MESSAGE NO LONGER ACTIVE ON GROUND TEST DISPLAY.