Oil leak on 3.0 V-6 Engine?

I need help locating an oil leak on 1991 3.0 engine. Leak is up high at rear of engine on passenger side.

Took it to the mechanic and ................ He told.............

If leak is from top at rear my bet would be that valve cover gaskets are leaking. They are not too hard to change.

Replaced valve cover gasket and problem is solved.Complete leak is stopped.