theclutch

Hi folks, I just changed my wife's oil in her B8.5 S5 today. While doing my normal OCD stuff, I noticed a bit of oil (I should have taken the pic BEFORE I wiped them down) in the areas marked in red. The connectors were soaked with oil. But the oil wasn't from the oil pan. The oil was clear (not dirty like the engine oil that I just changed) as if it were new engine oil. I am wondering if this silvery rectangular thing (what is this thing?) has sprung a leak somehow. Is this the power steering rack? It was crazy bitter cold up here in the northeast for about 2 week straight - 0F to 15F. I did notice that the plug had some greenish residue along the threads. But this was DRY. So I'm confused as to where this oil could have come from.

Any thoughts? As always, thanks in advance for any assistance.