Something borrowed, Something new 2

AU. FNAF 2 takes place after FNAF 1. After the management found out the older animatronics deactivation code was malfunctioning, they decided to program the new ones to keep an eye on them, and giving them up-to-date technology. They now have one goal; Keep the old animatronics in Parts and Service. But how does this affect them? And who is the unknown being in Prize Corner?