As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATH FLT 759 ATH TO PHL. FLIGHT RECEIVED EICAS MESSAGE - L ENG FUEL FILTER. FLIGHT RETURNED TO FIELD AND LANDED WITHOUT FURTHER INCIDENT. REMOVED LT ENG LP FUEL FILTER AND INSPECTED WITH NO FINDINGS. REPLACED LP FUEL FILTER AND FUEL FILTER DELTA P SWITCH.