As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK, RT OIL FILTER ANNUNCIATOR CAME ON IN CLIMB. FOLLOWED SHUTDOWN PROCEDURE RETURNED TO DEPARTURE. REPLACED SCAVANGE OIL FILTER ELEMENT AND OIL PRESSURE DIFFERENTIAL PRESSURE SWITCH IAW FIM TASK 79-35 FAULT TREE 803. LEAK CHECK OPS CHECK PENDING. CHECKED CONTINUITY OF WIRES OK IAW FIM 79-35 FAULT TREE 803 BOX 4. ACCOMPLISHED LEAK CHECK & GROUND RUN OPS CHECKS OK.