As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CREW REPORTED THAT THEY HAD NR 1 ENGINE FUEL FILTER BYPASS LIGHT ILLUMINATE IN CRUISE. ENGINE OPERATION WAS NORMAL. FLIGHT DIVERTED TO ALTERNATE DESTINATION. MAINTENANCE PERFORMED TROUBLESHOOTING IAW AMM 73-4-1. REPLACED THE FUEL FILTER. NO CONTAMINATION PRESENT AND FILTER WAS REPLACED. UPON FLIGHT TERMINATION, THE FUEL FILTER DIFFERENTIAL PRESSURE SWITCH WAS REPLACED TO CLOSE THIS DEFECT AND REMOVE MEL RESTRICTIONS.