About halfway through Chapter 7, in the mainframe room.
There should be a maintenance access vent, which I think you need to go through anyway. To the right, there should be a button that changes where the vent will lead you.
Go through the vent, and into a room where there should be 3 panels, use Kinesis to rip the panels off the walls. There should be some squares with black dots on them you can use Kinesis on.
Take them off, and put them into the 4 Holes on the left panel.
Spoiler:A Super Slasher will pop out, as well.
If the dots glow a Purplish Blue, it's in the correct spot. If it glows RED, it's in the incorrect spot. Shouldn't take too long to finish it.
Once that's done, a panel on the wall next to the maintenance vent will open up, revealing another button. Press it, and the maintenance vent will rotate again. Once that's done, go through the vent into a separate room. Look behind you, and you will see the PENG Trophy. Pick it up, and you get a trophy + an item to sell for 10K. Also a couple of other goodies there.
And also, you can find numerous video guides on YouTube, which will usually help you with whatever it is you need.
Hope this helped.