Valley coolant leak

In process of completing the full ******s on the truck, among a bunch of other parts. Valley was filled with sludge when i tore it down and removed turbo and all associated parts. During working on the truck i notice the valley continues to get a little coolant in it after a few hours. I had to scrape a bunch of stuff out of the valley and under the high psi fuel pump. Im not sure if when i cleaned if i transfered coolant sludge on to this fitting under the cp4. But does anyone know what this fitting is? Or is there anything else around the cp4 that could be leaking. Truck hasnt been filled with coolant but im wondering if because of the heat its allowing whatever stuff i havent cleaned up to become more fluid and leak into the valley just before the turbo.

Check the heater tube o ring and the coolant fitting/line on the turbo.

wont be coming from hpfp, like ^^^^ he said, check the coolant feed line that comes from beside the hpfp and goes to the top of the turbo.