As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENG OIL FILTER SENSOR L THE PRESSURE SWITCH FOR DETECTING IMPENDING OIL FILTER BYPASS ON THE LEFT ENGINE HAS FAILED. MAT SHOWS NOT ACTIVE FOR MAINT MSG 79-60861. ACP INITIAL EVALUATION. MAT DOES NOT SHOW MSG ON EXIST FAULT SCREEN. ACP FIM 79-98-803-ERASED STS MSG. INFO TO SAMC. IN VIEW OF ACTIONS ALREADY TAKEN PREVIOUSLY APPLIED MEL7935B AND COMPLIED WITH. LEAK CHECK SATISFACTORY AFTER ENG RUN. DUE TO HISTORY, REPLACED OIL FILTER DIFFERENTIAL PRESS SWITCH. NO FURTHER ISSUES NOTED.