As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT AT FL300, THE NR 1 ENG FUEL, FILTER BYPASS, LIGHT ILLUMINATED & STAYED ON FOR THE REMAINDER OF THE FLIGHT. NO EMER WAS DECLARED & THE FLIGHT DIVERTED WITHOUT FURTHER INCIDENT. REPLACED ENG 1 FUEL FILTER. DEFERRED ENG 1 FUEL FILTER BYPASS SWITCH IAW MEL PROCEDURES. THE ACFT WAS GNDED. SUPPLEMENTAL INFORMATION. R & R ENG 1 FUEL FILTER BYPASS SWITCH IAW AMM 73-34-01.