205 GTI block, corrosion at the base of #1 liner, punctured the block wall.
I know this sounds like a good candidate for the scrapper, but I don't think I have a chance to get a better one. This was bought s/h here, so I expect a good chance any other block would be in the same situation and don't really want to buy another one to find it with the same problem. Didn't look too bad before cleaning, but after it was revealed the little pockmarks in the side were a lot deeper under the surface. The extent is not that much, but needs a serious professional job.
I guess if anyone knows how to properly weld aluminium and can explain what to ask of the machinist, it might be salvageable.