Coolant Leak Somewhere

[Rawze]

You should not rule out the turbo actuator itself leaking. I have seen many of them do this and the coolant seeps out from around the base and down along the turbo exhaust housing. The very first picture you posted point to this being a possible cause.

There is also a freeze plug in the top of the turbo betwen the turbo and the actuator. They will sometimes start leaking there too.

Either case, you have to remove the turbo actuator and check for coolant seepage in between the 2.