As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT PERFORMED AIR RETURN TO ICN DUE TO ENG 1 FUEL FILT MESSAGE.(<P>ONCE BACK IN BLOCKS, DEBRIEFED CREW AND DETERMINED ALL ENGINE PARAMETERS WERE NORMAL AND NO ERRATIC ENGINE CONDITIONS. ENGINE OPERATION WAS NORMAL.<BR /></P><P>MAINTENANCE INSPECTED AND REPLACED THE FUEL FILTER. NO DEFECTS FOUND. OPS AND LEAK CHECK GOOD.<BR DATA-MCE-BOGUS="1" /></P>)