As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE FILTER BYPASS LIGHT CAME ON FOR 2 MINUTES ON TAXI OUT. ACFT GROUNDED. R & R FUEL FILTER DIFFERENTIAL PRESSURE SWITCH ON NR 1 ENGINE REF MM73-34-01-000-801-F00, MM73-34-01-400-801-F00. ACCOMPLISHED NR 1 ENGINE FUEL LEAK CHECKED AND RAN ENGINE LEAK CHECK GOOD.