As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON TAKEOFF OIL PRESSURE ON LEFT ENGINE STARTED DROPPING AND VISUAL INSPECTION NOTED OIL POURING FROM ENGINE COWLING. ENGINE SHUTDOWN AND AIRCRAFT RETURNED. CANNON PLUG ON CHIP DETECTOR WAS INSTALLED 180 DEGREES OUT AND WAS HITTING ON LOWER COWLING RIB.