As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE MAINTENANCE MESSAGE 73-31071 THE FUEL FILTER SIGNAL DISAGREE LONG TIME FAULT DEFERRABLE PER ASA T/C 78273000. GROUNDED - YES. REPLACED ENGINE 1 FUEL FILTER DIFFERENTIAL PRESSURE SWITCH REF B737-800 AMM 73-34-01 OPS CHECK GOOD NO LEAKS.