As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKEOFF THE OIL PRESSURE DROPPED TO 45 PSI ON THE LT ENGINE. CREW FOLLOWED QRH AND FEATHERED ENGINE FOR LOW OIL PRESSURE AND FLEW BACK TO THE AIRPORT. AFTER LANDING, VERIFIED OIL LEVEL AND CHECKED ENGINE CONDITION PANEL WITH NO FAULTS FOUND. DISCOVERED THAT BY SWAPPING INDICATORS THAT IT WAS AN INDICATION PROBLEM. INDICATOR WAS REPLACED AND ACFT RELEASED FOR FLIGHT.