Stand easy, they're not after the crew, they're after United. This is straight from the playbook.
Unintended consequences. The CVR will be in the public domain, therefore the FAA is apt to listen to it. A well documented case at my airline had the FAA take note of a conversation prior to departure where the FO said he was tired and had considered calling off the trip. A number of hours later at the destination, ground personnel marshaled the crew into the gate and clipped the wing of an adjacent aircraft. This on the Captain's side. The crew was found not to be at fault, however the FAA went after the FO for flying fatigued, based off a comment on the CVR. Dismissed but not after many sleepless nights, pun intended.