What was found
FUEL FILTER BYPASS LIGHT FOR NR 1 ENGINE. DEBRIEFED CREW, FUEL FILTER BYPASS LIGHT CAME ON FOR ABOUT 30 MINS, FLIGHT ATTENDANTS REPORTED A FUEL ODOR IN CABIN. THE FUEL BYPASS LIGHT EXTINGUISHED DURING DESCENT & REPORTED THE FUEL ODOR DIMINISHED. THE LIGHT REMAINED EXTINGUISHED FOR THE REMAINDER OF FLIGHT. TOTAL FUEL IS 18.6, PERFORMED EEC BITE ON NR 1 ENG. FOUND MM 73-31071 FUEL FILTER SIGNALS DIASAGREE NR 1 ENG DUAL CHANNEL FAULT. NR 1 ENGINE EEC GROUND TEST PASSED AND FUEL FILTER LIGHT EXTINGUISHED. DUE TO REPORTS OF FUEL FILTER BYPASS LIGHT BEING ILLUMINATED IN FLIGHT, PERFORMED FIM TASK 73-05 TASK 801 UP TO STEP E, SUBTASK 4, J8 HARNESS REPLACEMENT. EEC BITE TEST GAVE FAULT CODE 73-31071 NR 1 ENG DUAL CHANNEL FAULT. BOTH FUEL FILTER DIFFERENTIAL PRESSURE SWITCH & FUEL FILTER WERE CHANGED VERY RECENTLY AT ANOTHER STATION. THE NEXT STEP IN THE FIM WAS TO DO A WIRING CHECK OF THE ENG 1 FUEL FILTER LIGHT, DEU1 AND DEU2. NO WIRING ISSUES WERE FOUND. REMOVED AND REPLACED ENG 1 J8 WIRING HARNESS, IAW AMM 73-21-06, EEC TEST AND TEST 12 ACTUATORS TESTALL OPS CHK COMPLETE, NO FAULTS FOUND, IDLE LEAK CHK GOOD, IAW AMM 73-21-06.