When atop the building with sector 2's artillery button, proceed to the north stairs, and turn left (west) and enter the opening between the walls. Following the alley, then climbing the stairs, there is a large machine. A dead Enclave soldier, a Ripper, 2 Psycho, a couple of first aid boxes are all behind the machine, with the holotape on the Enclave soldier's body.
Where is it? Where is it? God damn it, where's... There we go [Sighs] Ah yes. Prime, you big son of a tin bitch you're gonna die! What? You're kidding me? Already? [Clears throat] Okay, okay, okay, a lot of shit going on. [Clears throat] Prime, you'd better be there you bastard. [Clears throat] Shit... How's this thing on?
Presumably "it" in the log refers to the psycho found beside the soldier's corpse.
pc xbox360 Sometimes the soldier and the holotape will simply not spawn. Loading a save from another cell, then reloading a save from this cell may fix this. [verified]