Puesta del Sol switching station The Puesta del Sol switching station is a in the Sierra Madre ' s Puesta del Sol , where Christine is sent to perform her part in the opening ceremony . Layout . The first room contains two terminals with various lore , a Lover ' s Mark stash , and the electric box which must be repaired for the Mixed Signals quest . The electric box can be repaired with a Repair of 60 ( there is a Fixin ' Things on the large box to the left of the locked door ) , with three of the electric box fuses found in locations in the Puesta del Sol area . The passageway which begins at the far end of the room contains a series of three shootable speakers . Each of the three is made a bit easier to locate by the graffiti on the walls reading " tick tick tick , " along with arrows pointing toward the speakers . The first is up and to the right as one leaves the first room ; the second is around the next corner in the alcove with a console , and the third is up in the rafters on the left just before the passage ends in a ledge in the next large room . Alternatively , there are safe spots between some of the speakers which one can find if one wishes simply to run forward . The large room ahead initially has its lower reaches obscured by toxic red cloud , and the walkway across to the pathway forward ( the doorway marked " Utility " ) is missing . For brute force progress forward , one can descend the steps and rush through the cloud to the other side , but note there are several bear traps hidden in the cloud . Alternatively , one can descend only one set of stairs to the first small landing , and leap across to the large pipe to the east , and run across it to reach the other side with minimal cloud exposure . At the of southwest end of the room , a small room module contains a and a terminal to shut off some nearby speakers , including the shielded speaker right above the room module itself . A deadly tripwire trap is concealed by a corpse right before the terminal - - the grenade bouquet is hidden up between the second and third consoles on the far wall as one enters the module , and even if one has Light Step the tripwire can be triggered if the paint gun on the ground is kicked . Reaching the terminal safely to shut off the speaker is of course much simpler when one is traveling with Christine , leaving time to disarm either the tripwire or the grenade bouquet before going to the terminal . Once this is accomplished or ignored , one can proceed to the north end of the room and head east through the door to the Utility room . The Utility area is a series of two small rooms and contains the ventilation console for removing most of the toxic cloud from the Puesta del Sol north area , a terminal with lore , some armor - piercing ammo for the automatic rifle , and the remote maintenance terminal password in Ennis ' s locker , which is Very Hard locked but a key can be found later sitting on a desk at the southeast end of the final room . The final room begins with both a turret and a shielded speaker , and there are gaps in the catwalks which can require careful jumping or detours . The speaker can be shut down at a terminal in the small room module directly across to the east , but the door requires a 75 Lockpick to access . There is likewise a 75 Science terminal to shut down the turret located in a small alcove room halfway down the west wall . Once these threats are dealt with or bypassed , the elevator for the Mixed Signals quest can be found in the southwest module of the room , next to the remote maintenance terminal which can improve that quest ' s outcome . The Vending machine code for the holorifle reinf . components can also be found in this room on a console against the west wall . The elevator also allows one to travel " up " and reach a quicker exit back to the Puesta del Sol area without traveling back through the building . A " " can be found in this room as well , on a catwalk in the south - central part of the room : there is a huge machine on the south side of the room ( but north of the module containing the terminals ) . The book is located on the catwalk that runs around the machine . It is the only portion of catwalk in this room that one has to jump to . Appearances . The Puesta del Sol switching station appears only in " " add - on " Dead Money " .