The daunting task of rebuilding Liberty Prime requires the Brotherhood to amass a tremendous amount of raw materials, including delicate electronics and lenses. Scribe Reginald Rothchild wants to kickstart the project and amass these rare materials for the process.
This simple collection quest becomes available after completing Who Dares Wins. Players simply have to ask Rothchild how they can further help Lyons' Brotherhood of Steel. He will ask the player to return any sensor modules and cameras to him, so that he can salvage them for electronics and lenses. The rewards are 100 caps and 25 experience points per camera and 75 caps and 10 experience points per sensor module (the notification is displayed after exiting dialogue).
Both of these items are commonly found in toolboxes and near workbenches. Obviously, this collection quest will not rebuild Liberty Prime, which only takes place in Fallout 4.