I noticed after replaying Fnaf Sister Location that the camera in the breaker room says "Elevators" This could mean that a different elevator might hold more secrets! I don't know though. Let
How to Access the Secret CD Room - Five Nights at Freddy's: Security Breach Wiki Guide - IGN
Five Nights At Freddy's: Security Breach - How To Find Secret Sister Location Room & Use Retro Discs | Super Easter Egg Guide - Gameranx