9T3VETTE

So I have a minor oil leak which has literally been around for a decade or so. It's a small amount so I've never really worried about it, but it's enough to soak the oil pan after sitting for a winter.
I'm tearing into it a bit right now and access to the area is pretty good so I figure why not check it out.
It's not the rear China wall as its dry and was redone a few years ago. The oil pressure sender area is dry along with the rear of the valve covers.
I would think the oil temp sensor or the filter housing adaptor would be the culprit but it's wet above that area which seems weird.
If anyone can help I'm all ears