As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FL 1036 - LEFT ENGINE FULE FILTER PRESSURE DROP LIGHT CAME ON IN FLIGHT. CREW PERFORMED ABNORMAL PROCEDURES AND RETURN TO FIELD. PIT - A/C LANDED WITHOUT FURTHER INCIDENT. REPLACED LEFT ENGINE FUEL FILTER (OLD FILTER CLEAN) ANF REPLACED LEFT ENGINE FUEL DIFFERENTIAL PRESSURE SWITCH. RAN ENGINE AND LEAK CHECKED OK. OPERATIONALLY CHECKED SYSTEM, OK. (M)