In floor 2 after passing the bulk door that leads to garage there is a CL3 Keycard scanner which always appears too late. Normally keycard scanners only load when there are someone close to them but that spesific one is always acting up. There is a really easy way to make that scanner appear. Do keep in mind that there is always another scanner at the opposite side of the door. All you have to do is approach the keycard scanner at the other side from the point where you are standing. It will be obviosly at the other side of the wall but loading the keycard scanner outside will also load the one in inside. Just by touching the wall with your body both keycard scanners will appear. Here is a video of what exactly I mean:
