As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI, LEFT FUEL FILTER BYPASS LIGHT ILLUMINATED AND EXTINGUISHED TWICE. FUEL FLOW INDICATIONS WERE NORMAL UP TO 50% N2. ACFT GROUNDED. REMOVED AND REPLACED NR 1 ENGINE FUEL FILTER DIFFERENTIAL PRESSURE SWITCH IAW AMM 73-34-01, OPS AND LEAK CHECKED GOOD.