As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAKING THE RUNWAY FOR TAKEOFF, THE MASTER CAUTION CAME ON AND FUEL MAINT FILTER BYPASS LIGHT ILLUMINATED. ACFT GROUNDED. REMOVED AND REPLACED THE NR 2 ENGINE FUEL FILTER DIFFERENTIAL PRESSURE SWITCH IAW AMM 73-34-01-400-801-F00. OPERATION AND LEAK CHECKED GOOD. ACFT OK FOR SERVICE.