1.2 TSI: after chain change engine leaks/sweats on chain box

So, there’s one thing I’m going to see about the 1.2 TSI, 86 PS, BJ. 09/2011, 29,000 km. First service was done after 2 years in the garage. On Kulanz, I had problems with the well-known chain rattle, the workshop changed the control chain to the new model. Supposedly my old chain was already a bit long. The whole thing was before the expiry of the warranty, the workshop also exchanged the part without having to show that there was something rattled. Very kulant! That was about in summer 2013. A few weeks ago I noticed that my car had lost oil at the area of the control chain box or was oily at the bottom of the oil separator. In addition, he had a small “lacherl” in the garage. I don’t know how this area is exactly called, but he still knows in the picture 1.