Rear engine oil leaks

[Jhogan0101]

Im having a hard time locating source of rear engine oil leaks.
After flight seeing a good amount of oil on the pilot side rear cowl under the tail cap.
Inside looks wet on the upper exhaust tree, pilot side.
Not seeing any evidence of leaking on the top half of engine.
Ive tried looking at the engine while running with the cowl disassembled and dont notice any leaks.
Does anyone know of any good strategies to try and hunt down this leak(s)?