No one aboard ship can believe what their commander has done, but they know exactly why Shepard has stolen the Normandy . Chat with the crew, who all stand at their usual spots, to find they’re all behind you.
No new Codex entries can be gained through investigation or dialogue aboard the Normandy at this time, and the salarians led by Captain Kirrahe disembarked back at the Citadel.
The ship’s Req Officer still has wares to sell, of course, and you may find some new gear stashed within Shepard’s locker.