As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORT: DURING FLIGHT MESSAGE (L OIL FILTER) DISPLAYED. OIL PRESS AND VIBRATION WERE NORMAL. ENGINE WAS NOT SHUTDOWN. FLIGHT RETURNED. FIM 792100 PAGE 103 WAS PERFORMED; REPLACED SCAVENGE AND PRESSURE FILTER ELEMENT IAW AMM 79-21-08/07/ 401, MAGNETIC CHIP DETECTORS WERE INSPECTED AND WERE FOUND IN NORMAL CONDITIONS, SCAVENGE FILTER DIFERENCIAL PRESSURE SWITCH WAS REPLACED IAW AMM 793502/402 AND CHAFING WAS ELIMINATED IAW WDM 71-51-11/19/ 79-35-11 WITH SATISFACTORY RESULTS.