The first lever can be found below the screen with the gate; the second is further down below the fist main room of the area. If you follow the water, you'll find them both.
I found the second power lever at the top but it's blocked by a door that won't budge. Any ideas? Thanks for the reply:P
You can get there by dropping down the bridge next to the gate switch, or via the manhole if you get a little wacky with the platforming
