Mechanic did a radiator pressure test and the radiator lost pressure after about 20 minutes. Started test as 16 pounds and it lost about one pound in 20 minutes

drained and flushed the cooling systems 3 times using prestone flush kit and prestone flush solution.
Each time after flushing and getting a clear flow of coolant- thin wists of a slippery grey slime appear on the top of the coolant in the radiator. This is after running around town for 30 or so minutes

I noticed on the driver side intake manifold upper edge where it meets the heads there is a trail or seam of shiny slippery liquid. it does not appear to be coming from the valve covers.

Also a thin film of oil is leaking from the lower timing chain cover passenger side. This took about two days to develop after thorougly cleaning the surface.

And other than when I got the entire enigin soaked while flushing it runs and idles fine.