As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE NR 2 ENGINE FILTER ICING LIGHT CAME ON AND WOULD NOT CLEAR WITH FUEL HEAT. OTHER ENGINE PARAMETERS INDICATE FUEL HEAT WAS OPERATIVE WITH ENGINE OPERATION NORMAL. UNEVENTFUL RETURN TO DEPARTURE AIRPORT. REMOVED AND REPLACED NR 2 ENGINE MAIN FUEL FILTER IAW WITH , MM 73-11-01 WITH GOOD ENGINE RUN. NOTE: REMOVED FILTER VISUALLY HAD SLIGHT AMOUNT OF DEBRIS PRESENT.