As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, THE CREW NOTED AN ERRATIC INDICATION FOR THE LT OIL PRESSURE. THE CREW PERFORMED AN AIR-TURN-BACK AND MADE AN UNEVENTFUL LANDING. MX INSPECTED THE SYSTEM AND CLEANED THE OIL PRESSURE TRANSDUCER. MX RETURNED THE AC TO SERVICE WITH NO FURTHER DEFECTS. (K)