Benign Intervention

Benign Intervention is a broken quest in Fallout 4.

Detailed walkthrough

 * 1) Once Cait trusts you enough she'll tell you about her history and her current struggles with addiction, then suggest going to Vault 95 to seek treatment.
 * 2) Head to Vault 95 in the south west corner of the map.
 * 3) The Gunners have claimed the vault, so you'll need to fight your way in. The room on the right after leaving the elevator (locked with an Advanced lock) has a terminal that can be used to deactivate some turrets ahead.  Watch out for traps throughout the vault.
 * 4) Ahead there's a large room with several enemies, a Master level terminal blocks the door to the South that leads to the detox chamber. Alternately in the Overseer's office in the upper west side there's an unlocked terminal that can open the door.
 * 5) Once passing by the door there's several more gunners in the cafeteria, go upstairs and around to the terminal, inside there's a Gunner Commander, turret and an active bottlecap mine on the desk.
 * 6) Talk to Cait, she has misgivings about the process. You'll have 3 easy persuasion options, all of them give the same result.  Once she gets into the cair activate the terminal and watch the chair work.
 * 7) Speak with Cait again once it's done and the quest will end.

Quest stages

 * 1) Bring Cait to Vault 95
 * 2) Locate the clean room
 * 3) Speak to Cait
 * 4) Wait for Cait to get in the clean room chair
 * 5) Cure Cait's addiction
 * 6) Speak to Cait