|The following is based on Van Buren and is not canon.|
Repair the PA/Klaxon system was going to be a quest in Van Buren, the canceled Fallout 3 by Black Isle Studios. It is located in Denver, and can be completed at one of the repair stations.
You can repair the PA system klaxons at one of the repair stations to sound alarms or broadcast messages throughout town.
Character type completion breakdown
Science Boy - Is the winner.