The pre-Upheaval archive beneath the Tower. Its environmental section was sealed three months ago under an Infrastructure Assessment Quarantine, staff included. The 2062 damage report is in there, and so is a failed mold-containment barrier.
A below-line scavenger has the length of the Memorial speech to pull a sealed engineering report out of a mold-choked archive, and there is a second document clipped to the back of it.