Does anyone have a picture of where the tube from the oil separator drains back into the engine? I know that the turbo drains at the tube pictured below. But, I'm trying to remember where the oil separator tube drains back into the oil pan.

The separator drain is just inboard of the turbo drain. In your picture, the turbo return line is obscuring the separator drain line.

Info here:

617 engine, replacing the oil separator check valve in the upper oil pan.

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The Oil Seperator Drain Tube has an O-ring at both ends of it and a single blot or stud in the middle of the tube that attaches the tube to a support frame that is under the Turbo Charger (on my year and model).

On mine that bolt and nut combination were loose. Others have had the tab that is welded to the drain tube crack and leak or crack off entirely. Some drain tubes don't have the welded tab on them but a sheet metal clamp.

Behind the turbo drain is a nipple with an O-ring that protrudes from the top of the crankcase to seal the bottom.

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