Exactly what was just said.
I had a Sav for five years and he perished because things were "almost" right.
A good starting point will be to read these sites over and soak it all in, print them out on paper if you have to.
http://www.varanus.us/
A nice writeup by Daniel Bennett
Savannah monitor dot org appears to be down at the moment.
check out the reptile report, there is a lot of Savannah Monitor info flying around there at the moment.