Exactly what it says in the title. I DL'd and installed this DLC after finishing all of Liara's quests (up through Observer). This is my first play through (late to the game, I know) so I don't know exactly where I am in the timeline, but I've recruited everyone except the final squadmate and most of the sidequests- I'm basically ready to go through the Omega 4 relay. However, since the DLC states it can be played even after the game is finished I'm not sure my progress is relevant. The message from Cerebus that triggers the quest never appears in the terminal. I have also tried going to talk to Liara directly and looking for the mission on the galactic map. Any idea how I can fix this?
Version: 1.02
AMD Phenom II X4 955 Processor / 3212 MHz / 3.25 GB
NVIDIA GeForce GTX 470 / 1.25 GB / Driver 275.33
Headphones (High Definition Audio Device) / Driver 6.1.7600.16385 (no dedicated sound card

)
Microsoft Windows 7 Ultimate (6.1.7600)
DirectX 10.0 (Mar2009) or later
Save file is completely unmodified. I have an alt character I am slowly working through the game with, who also doesn't have this mission, but he hasn't finished Horizon yet (a prereq stated on the wiki) so I doubt that is relevant information.