Our heroes manage to activate the rising stairs and encounter the Webmaster. Cautious and concerned the heroes followed the creature's directions to the next level of the Clockwork Castle, where they spoke with "the Watcher," an entity which keeps the records of the 41st Modron Unit, and keeps the Clockwork Castle in order.
The Bookkeeper explained that—every 289 years—modrons are sent out into the Planes to collect data for Primus. This exodus is called the "Great Modron March." Unfortunately, modrons are not known for their survivability, and it is rare that even a small fraction of the modrons sent out on the march survive. The Bookkeeper, and a group of modrons known as "0041," have survived the Great Modron March by banding together within a giant "Windghost" and heading back towards Mechanus; however they've wandered for over 900 years trying to find their way back to Mechanus and unable to do so.
The Bookkeeper informed the group that the Windghost was probably dying, and that they were running out of time to return to Mechanus. Unable to leave the Archival Room, the Bookkeeper asked the party to fix the "gate" that would allow the modrons to return "home." He also mentioned the worrisome trend for the modrons—no longer connected to Primus—developing their own personalities and sense of "self."
The party ascended from the Archival Room with the help of some loaned modrons, woke up some clockwork citizens, and made their way to "the surface."