As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ENGINE RUNUP OIL WAS OBSERVED LEAKING FROM SEPARATOR LOWER OUTBOARD CORNER. INSPECTION REVEALED SEPRATOR CORRODING/ RUSTING FROM INSIDE OUT. OIL LEAKING THROUGH CORROSION PINTS IN BOTTOM ONTO EXHAUST. REPLACED WITH NEW UNIT. RECOMMEND INSPECTION AT EACH ANNUAL INSPECTION.