As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT ENGINE FUEL FILTER BYPASS LIGHT ILLUMINATED DURING ENGINE ACCELERATION DURING TAKEOFF. EXTINGUISHED AT IDLE. LIGHT ILLUMINATED AGAIN DURING 2 SUBSEQUENT RUN UP TESTS. INSTALLED A NEW FUEL FILTER ELEMENT ON RT ENGINE IAW MM CH 73-10-05. OPERATED RT ENGINE FOR 5 MINUTES AT TAKEOFF POWER DETENT, NO DEFECTS NOTED.