Bring the Goblin Rumors to Kravel Koalbeard in the Shimmering Flats.
I had to use some of my favors, and gave away a rare bottle of elven wine, and did some heavy deducing myself! But I found the information you seek.
Here, I wrote a letter with some very interesting bits on our friend, Nazz Steamboil. Do with it what you will -- it's too dangerous for me to use.
Just don't tell anyone where you got it!