As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - DURING CRUISE, LEFT ENGINE FUEL FILTER CLOG LIGHT ILLUMINATED. RETURNED TO JFK AND LANDED WITHOUT INCIDENT. REPLACED NUMBER 1 AND NUMBER 2 ENGINE FUEL FILTERS. ENTERED EACH FUEL TANK AND INSPECTED IN EACH TANK. FOUND SOME EVIDENCE OF OLD SEALANT. CLEANED TANKS AND ACCOMPLISHED RUN UP AND REPLACED FUEL FILTERS AGAIN. NO CONTAMINATION NOTED. SYSTEM GROUND CHECKED NORMAL OPERATION.