As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAT - LEFT ENGINE FUEL FILTER INDICATION LIGHT ILLUMINATED DURING CLIMB AT 11,000 FEET. AIRCRAFT RETURNED TO STATION WITHOUT INCIDENT. MAINTENANCE REPLACED LEFT ENGINE HIGH PRESSURE FUEL FILTER. PERFORMED ENGINE GROUND RUN. ENGINE OPERATION NORMAL. AIRCRAFT RETURNED TO SERVICE. (X)