I need the 3 fragments of the droid engineer's voice to open the air lock. I got 1 from the security room, 1 from the first room to the right downstairs on the level with the HK droid, but I can't find the last one. I've looked for an hour with no luck.

 

Anyone remember where to go?

The HK droid has the last piece. Talk to it once you receive the sonic imprint sensor and record what it says.

You get it from HK50 but you can actually get the whole thing from him, you don't have to run around like a headless chicken.

If you have enough persuation points, you can get the HK droid to say it, thus having it recorded in the sonic sensor.

I did that but which air lock is it for i blew up the one to progress ;/