bad oil separator?

[wanna986]

Before replacing a good part, can anybody confirm that this could be happening as a result of a bad oil separator?

2002 986 S
I have a situation where oil is pooling on top pf the engine on the passenger side. There is definitely oil in the throttle body and oil film around the body of the separator.

Now, if the unit is bad, is it possible for oil to start backing up through the filler tube and escape at the junction, making its way along the underside of the tube and eventually dripping on the engine where I see it? The accumulation appears to be directly below the path of the tube, so this is why I'm asking. The junction of the filler tube is slightly wet.

Finally, I am talking about pooling, not just wet spots typical of seepage.

Anybody hazard a guess?