As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT EICAS MESSAGE "L ENG FUEL FILTER" SHOWED. DUE TO ETOPS RESTRICTION RETURNED TO OKO. LP1691828: ENG RUN DUE PER COMPANY REQUEST.(<P>REMOVED AND REPLACED LT ENG FUEL FILTER ELEMENT IAW B767 AMM 73-11-02. LEAK CHECK NORMAL IAW B767 AMM 71-00-00, NO DEFECTS NOTED. LP 1691828: PERFORMED LT ENGINE RUN IAW B767 AMM 71-00-00, ENGINE STARTED STABILIZED, NO FAULTS OR DEFECTS. "LT ENG FUEL FILTER" DID NOT REPEAT.</P>)