As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT ENG STARTED LOSING RPM. PILOT REPORTED FUEL PRESSURE DROPPED BELOW NORMAL RANGE BUT HAVE TO BELIEVE IT WAS OIL PRESSURE. ENG WAS CAGED AND LANDED SAFELY. THE OIL PRESSURE SCREEN WAS FULL OF ALUMINUM RESTRICTING OIL FLOW TO THE ENG. ON TEARDOWN, THE NR 4 CYL WRIST PIN PLUG WAS BALLED UP TO ABOUT HALF ITS NORMAL SIZE AND THE REMAINING METAL WAS FLUSHED THRU THE ENG AND INTO THE OIL SCREENS.