As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CREW REPORTED THEY HAD NR 1 ENGINE FUEL FILTER BYPASS LIGHT ILLUMINATED. ENGINE OPERATION WAS NORMAL AND THE ACFT DIVERTED TO LANDING UNEVENTFULLY. IN MX DRAINED FUEL FROM THE PUMP HOUSING DRAIN PLUG, FOUND FREE OF VISIBLE, GROSS CONTAMINATION. THE FUEL FILTER WAS REPLACED ON A SUBSEQUENT FLIGHT IAW MEL 73-4-1. AT THAT TIME THE FUEL FILTER DIFFERENTIAL PRESSURE SWITCH WAS REPLACED AS WELL.