As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, UPPER EICAS MSG LT ENG FUEL FILTER WITH STATUS MSG LT ENG FUEL FILTER. FLIGHT DECLARED AN EMER & RETURNED WITHOUT FURTHER INCIDENT. ACFT REMOVED FROM SERVICE. REMOVED FUEL FILTER FROM LT ENG & FOUND NON-METALLIC DEBRIS. REPLACED FUEL FILTERS ON BOTH LT & RT ENGS, & THE APU. THE ENGS & APU WERE RAN, & THE FILTERS WERE CHANGED AGAIN. THE REMOVED FILTERS WERE INSPECTED & FOUND FREE OF CONTAMINATION.