*ride the elevator down to the boiler room, and find a jackpoint there for "John" to mess with the system some more*
'Alrighty, DAHM, where is it you wanted us to look over?
The elevator begins to move downward. it's a quiet ride, and as the doors click open you are greeted with the musty smell of damp and undercleaned passageways. this is a wide hall, aparently an older part of the building, and still aparently 'unfinished' there seems to be storage for desks and whatnot, but no real personel would probibly get any of thease mildew covered things. the systems voice crackels over an aparently oudated loudspeaker from outside the elevator.
You'll find the closest access point to the blockage just down this hallway. simply follow the lights.
with this, the lights each 'flicker' in sequence, creating a visual trail for you to follow down the corridor and arround a corner.