Can't find upgrade function, 6.11

[Xeeg]

Hey guys, I've been looking at the new 6.11 AI and have been trying to write up some build orders for the zerg =D maybe even fill in the empty spots for opengnd3-5 and whatnot.
However I can't seem to find where the info is to tell the AI when to upgrade to lair. I've looked in all the Zerg folder and Zerg.galaxy and Zerg0.galaxy and no where does it actually tell to upgrade to lair or hive...
Just trying to get a lair upgrade going in a starting build order.
Thanks..

Also. I found where the comp decides to use a random opener, in a function called ZergInit. Is therea a similar function to call a random mid/late?