As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND FILTER PLEATS POPPED OUTWARD ALLOWING OIL TO PASS THROUGH UNFILTERED. FOUND AUXILIARY OIL FILTER INSTALLATION HOSES CROSSED REVERSING THE OIL FLOW THROUGH THE FILTER. RECOMMEND ONE-TIME INSPECTION OF HOSE ROUTING ON SAME TYPE INSTALLATIONS.