Install a new turbo, change the oil, test again. High copper is to be expected from the turbo bearings, and 17 isn’t really that high - we’ve certainly seen worse. Also high potassium, as they said, is a sign of a coolant leak, but yours isn’t that high that the oil was completely contaminated - those are parts per million, after all. This is a 163,000 mile car - there could be other sources of coolant contamination, like a head gasket, and you may need to chase those down, once you have verified a trend.
New turbo - remove the source of contamination.
New oil - remove the contaminated oil.
Run it, and test again.