As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE FILTER BYPASS LIGHT ILLUMINATED DURING TAXI TO GATE. SHUTDOWN NR 1 ENGINE IMMEDIATELY. FILTER BYPASS LIGHT IMMEDIATELY EXTINGUISHED AND REMAINED OUT. ACFT GROUNDED. R & R FUEL DIFFERENTIAL PRESSURE SWITCH. PERFORMED EEC TEST NO FAULTS FOUND. RAN ENGINE FOR 5 MINUTES AT IDLE. ALL INDICATIONS FOR SWITCH GOOD. NO LEAKS NOTED REF AMM 71-00-00 AND 73-34-01.