As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JUST BEFORE DESCENT LEFT FUEL FILTER BYPASS ILLUMINATED FOR 90 SECONDS THEN WENT OFF. FUEL TEMP 25 LEFT NR 1 ENGINE OPERATED NORMALLY. PERFORMED FUEL FILTER BYPASS LIGHT FIM 73 05 00 810 801. NO FAULTS NOTED. REMOVED AND INSPECTED FUEL FILTER NO DEBRIS FOUND REF MM 73 11 02 000 801. REPLACED NR 1 ENG FUEL DIFFERENTIAL PRESSURE SWITCH OPS & LEAK CK GOOD REF MM 73 34 01. NO FUEL FILTER BYPASS WARNINGS DURING LAST LEG OF FLIGHT.