I need help with this part. I killed the stormtropers in the tiefighter bay, then I went down the bay lift. I killed several mechs, then reached a room with lots of autoguns and troopers. Killed them. I then found a button that allows me to open more doors, but the lifts through the doors and hallways don't work. I'm confused about where to go. Did I miss something? I'm lost.