Halfway through chapter 7, you'll come across the mainframe room which will be indicated by a hologram repeating the line "Unauthorized visitor, mainframe."
Take a left, and use kinesis on the panel, and then press the button that appears once. Climb through the air duct to the other side where you'll see three kinesis panels on the wall. Take them off and you'll see you can take some power nodes out from behind two of the panels. Using kinesis, take the power nodes out of their current place and put them in the correct order in the left most panel. You'll know it's right when the power nodes glow blue.
After they're in place, a panel opens up near the air duct you crawled through. Press the button again, and crawl through the airduct again. At the end is a room with the PENG statue.
Credit for the video goes to jhaller2