As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS LEFT FUEL FILTER BYPASS ILLUMINATED, NO ERRATIC SIGNS INDICATION. FIGHT CONTINUE PER QRH. MAINTENANCE REMOVED AND REPLACED FUEL FILTER DIFFERENTIAL PRESSURE SWITCH AND ENGINE FUEL FILTER IAW FIM 73-05-00-810-801.F00. LEAK CHECK AND OPS CHECK OK. (SEE SDR # AALA201908079013)