Coolant leak, 4.8, losing about half the expansion tank per day or so

[neliconcept]

So I have done a bit of research and it looks like it could be the valley pipe or something along those lines. This really pisses me off, this #%$$%ing truck cannot just stop breaking shit.

I'm taking it in tomorrow to get one of my lug bolt holes retapped and I guess my question is, where would it be leaking if it is the valley pipe? I haven't looked underneath it but it looks like it is leaking in the front ish area and also towards the back. I can't really tell where it's coming from.

What am I looking at damage wise ($$$) If I had someone take care of this? I really don't have a spot or location to do the work myself and the thread that had the DIY has all of the images no longer being hosted so I can't see how to do it either.

Thanks for any help!