I'll have to dig up the list, but in brief...

Head gasket job, a number of oil leaks, several engine problems (they weren't sure about all of them, needed more diagnostic work), lambda tower, bad injectors, bad sparks, bad filters, bad lock, bad window regulator, broken lock button, broken AC/vents, some kind of problem when idling (valve? I never noticed when driving it), a bunch of other small problems, several line and wiring problems. The Mercedes estimate was about $6200. My favorite part of the estimate was the missing hood ornament, which they apparently charge $22 to install. I couldn't help but laugh at the ludicrousness of that.

It would have been a lot cheaper elsewhere, of course, but there were so many problems, several of which seem to indicate poor maintenance, that I decided it wasn't worth it.

Probably the most amazing to me was how clean most of the stuff SEEMED when looking at, and the quality of the outer body and interior. It was essentially a pretty apple with a rotten core.