As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENG OIL FILT SNSR L THE PRESSURE SWITCH FOR DETECTING IMPENDING OIL FILTER BYPASS ON THE LEFT ENGINE HAS FAILED. STATUS MSG-7960861 ACTIVE ER MODE MSG-7960861 ACTIVE ER MODE. SUPPLEMENTAL DATA UPDATE RPL'D LH ENG OIL DIFFERENTIAL PRESSURE SWITCH. CHECKED MCD'S REF MAINT TIP MT 79-UA01R1.