What was found
DURING PRE-FLIGHT, THE PILOT DISCOVERED A LARGE OIL SPOT ON GROUND COMING FROM ENGINE COWLING. REMOVED THE ENGINE COWLING, DISCOVERED THE OIL PRESSURE SWITCH TO BE LEAKING.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING PRE-FLIGHT, THE PILOT DISCOVERED A LARGE OIL SPOT ON GROUND COMING FROM ENGINE COWLING. REMOVED THE ENGINE COWLING, DISCOVERED THE OIL PRESSURE SWITCH TO BE LEAKING.