As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH A LOUD BANG WAS HEARD FROM THE RT SIDE OF THE AIRPLANE. THE RT OIL DOOR ON TOP OF THE ENGINE COWL POPPED OPEN AND OIL WAS SEEN STREAMING FROM THE COWL. AT THE SAME TIME THE ENGINE BEGAN TO RUN ROUGH WITH A NOTICEABLE CHANGE IN INDICATED OIL PRESSURE, TEMPERATURE, EGT AND CHT. WITHIN 5 SECONDS THE PROPELLER WAS FEATHERED AND THE ENGINE SHUTDOWN. THE AIRPLANE PROCEEDED TO LAND NORMALLY WITH NO EMERGENCY DECLARED AND NO FURTHER INCIDENT.