Yes, I thought about following the hose up. However, it is buried under the crossovers so it would mean pulling parts off....something I want to avoid as I have other fish to fry. I may change my mind once I finish my clutch/IMS/AOS project if I get a CEL. I now see that the parts catalog shows a "breather hose" for the power steering pump. I'm now thinking that this is the answer.
https://www.porscheatlantaperimeterparts.com/images/parts/porsche/fullsize/020040303.jpg