I dont know if you already know this and how to do it. But I just managed to spawn zul'aman aka open it.
What I did was. I wrote
.createinstance 568
And then u get a text that says instance xx created in xxx
use the xx number in the .goinstance part
.goinstance (xx) 119.152 1761.11 42.8081
(unfortunelly I didnt find Uldum...