Leaking water pipe - how hard to change?
 

Since coming back from service, my car has smelled a little or burning coolant.

Think its only a little because the tank is pretty full. Theres a small black metal pipe just above the manifold and just off from the cam cover which is glistening and theres water on the undercowl so I presume its leaking from there.

If you can understand my attempt at explaining where this pipe is, does anyone know how easy it is to inspect/replace?

Thanks