As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUEL FILTER BYPASS LIGHT ILLUMINATED ON NR 1 ENGINE DURING TAXI IN. EXTINGUISHED AFTER ENGINE START LEVER WAS MOVED TO CUTOFF. ACFT GROUNDED. R & R NR 1 ENGINE FUEL FILTER DIFFERENTIAL PRESSURE SWITCH IAW AMM 73-34-01-000-801-F00-400-801-F00. INSTALLATION AND LEAK CHECKED GOOD.