As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE CDU TASK CARD SHOWS LONG TIME FAULT MESSAGE NBR 73-21072 FUEL FILTER SIGNALS DISAGREE. GROUNDED-YES. REMOVED AND REPLACED FUEL DIFF PRESS SW AND FUEL FILTER, REF B737-800 AMM 73-34-01 AND AMM 73-11-02. LEAK AND OPERATIONS CHECK GOOD.