2006 C-13 Acert coolant leak!! Noob! O/O

G'day gurus!.
I have been noticing a sweet coolent spell when driving lately.

I have beed adding about 1/2 gallon every 2-3 days in order to bring it to the sensor to start and work for the day.
the "mechanic" I paid was unable to fid where the leak was coming from as there was lots of green coolant at the end of the day all ove the underside of the passenger suspention and the wind whipping it around.

I finally checked it myself in the mourning when all was cold, wiped the area down and idled the truck up to about 190-200 Deg. i found a small fresh coolant puddle. was behind the lower turbo looked to be at the seam above the freeze plug on the block!!.
I have attached pics for any assistance I can get. My maintenance fund is getting VERY low untill I get some jobs paid in Im expecting.

Sorry for the long winded description
Thank you for any assistance.!
(2007 KW W900s
C13 Acert 380 HP
530K dealer provided P/W that a platinum rebuild was done about 130k ago.

 

Sir,
thanks for your reply.
I do not know the proper name for some of the thing you mention.

the absolute furthest I could trace up was the dark upper half above the yellow circular plug where it appears the slightly less dark turbo bolts to the block.
i cant tell how much farther up it is trailing from (if at all).
I wish I could provide better info / pics.

 

Luckily niether of those things, exhaust is almost always clear, no sweet antifreeze smell out the exhaust I ONLY smell it from under hood when it get of hot motor / exhaust parts.

wouldnt a platnium rebuild prevent any of those thing from happening?? (new gaskets)

 

not driving all the way back to VA from Oregon, heh I have located it just need to find out "why" heh