As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK, RIGHT ENGINE OIL FILTER CLOGGED MESSAGE ON EOAP. T/S--SHOOK DOWN WIRING AT ENGINE -NTF. CHECKED AND REPLACED MAIN ENGINE OIL FILTER AND DETECTOR--NTF. REPLACED BAD OIL DIFF PRESSURE SWITCH. LEAK AND OPERATIONAL CHECKS OK.