What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Aircraft was transitioning from hattiesburg, ms (kpib) to dexter, MO (kdxe). About an hour after departure, the pilot noticed oil forming on the port engine cowling. Pilot continued monitoring the engine indicators and the oil on the cowling. When the engine oil pressure started decreasing, the pilot performed an emergency shutdown and declared an emergency. The aircraft diverted to Memphis International Airport (kmem) and landed with no damage. Mechanics investigating the loss of oil from the port engine found a pair of needle nose pliers lodged into the oil cooler. The pliers had punctured a hole in the oil cooler causing oil to leak into the engne compartment. This oil spread to the engine cowling. The loss of oil from the leaking oil cooler eventually caused a loss of oil pressure indication.
As the FAA filed it
AIRCRAFT WAS TRANSITIONING FROM HATTIESBURG, MS (KPIB) TO DEXTER, MO (KDXE). ABOUT AN HOUR AFTER DEPARTURE, THE PILOT NOTICED OIL FORMING ON THE PORT ENGINE COWLING. PILOT CONTINUED MONITORING THE ENGINE INDICATORS AND THE OIL ON THE COWLING. WHEN THE ENGINE OIL PRESSURE STARTED DECREASING, THE PILOT PERFORMED AN EMERGENCY SHUTDOWN AND DECLARED AN EMERGENCY. THE AIRCRAFT DIVERTED TO MEMPHIS INTERNATIONAL AIRPORT (KMEM) AND LANDED WITH NO DAMAGE. MECHANICS INVESTIGATING THE LOSS OF OIL FROM THE PORT ENGINE FOUND A PAIR OF NEEDLE NOSE PLIERS LODGED INTO THE OIL COOLER. THE PLIERS HAD PUNCTURED A HOLE IN THE OIL COOLER CAUSING OIL TO LEAK INTO THE ENGNE COMPARTMENT. THIS OIL SPREAD TO THE ENGINE COWLING. THE LOSS OF OIL FROM THE LEAKING OIL COOLER EVENTUALLY CAUSED A LOSS OF OIL PRESSURE INDICATION.