As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START NR 1 ENGINE FUEL FILTER BYPASS LIGHT ILLUMINATED AND THEN EXTINGUISHED TWO TIMES. ACFT GROUNDED. 73-31071 MAINTENANCE MESSAGE. ACCOMPLISHED FIM 73-05 TASK 801. REMOVED AND REPLACED NR 1 ENGINE FUEL FILTER DIFFERENTIAL PRESSURE SWITCH IAW AMM 73-34-01 AND FUEL FILTER IAW AMM 73-11-02. NO CONTAMINATION FOUND. LEAK AND OPS CHECK GOOD. NO CURRENT FAULTS ON EEC IAW AMM 73-21-00.