The compressor housing is oilier than I'd expect if oil was only leaking past the drain tube o-ring. I'd check the oil inlet fitting up top then gamble on a drain fitting gasket. Kinda looks to me like it's leaking between the center section and compressor housing, though.

The turbo oil feed line isn't clamped to the manifold.

Also looks like they used a non-MB quality valve stem seal on #3 exhaust.

I suspect the head has to come off again but I wouldn't have the same shop do the work.

Sixto
87 300D