Coolant leak and codes

[URDRWHO]

This is a 2007 V50, under 100,000 miles (in the 90's) car runs fine, MPG is good, a lot of power, idles well. This is my wife's commute car.

For a while we have been getting a PO2187 code but I can't find a vac leak. So because the car seems fine I've been clearing the code and going on with my life. Recently after the code was thrown I also looked at pending codes and I had a 300 301 and 302. Ok that is odd because I never feel any misfire.

This past weekend I'm under the hood and see the coolant is down a bit. I filled to the correct level.

Today when my wife gets home from her 30 mile stop and go commute I go to check the coolant. I am surprised to see coolant laying about - it was on top of my new upper motor mount, looked like some was on top of the reservoir and there was some down below the air inlet hose that is (I think) for the turbo. I'm not up to speed on the Volvo so forgive me if I am wrong about that big fat hose.

When the motor is running or not running there is no pressure in the expansion tank. I would guess that there is never much pressure because the cap is a 21 PSI cap which doesn't seem like much pressure.

Temp gauge needle sits straight up, never passes mid point.

With codes 300/301/302 misfires and leaking coolant a quick guess would be a small leak in the head gasket. No water in oil, car runs fine makes me think no on that one but maybe?????

Jaguar, Subaru or almost any domestic car and I'd be able to correctly diagnose. We have the V50 and an S60 both turbos and they are my first turbos so I am not sure what is what on the engine. I could have a water leak in the turbo system.

So I am calling out for help or ideas.