Custodian's log page 1 can be obtained from legionary remains, castra debris, administratum debris, praesidio remains, and carcerem debris at the Kharid-et Archaeology dig site. The other pages for completing the achievement Prison Break being page 2, page 3 and page 4. The page was once part of the log of Zarosian custodian Stepan Jovkai. Showing pages 1 and 2 to Liam will give the player a broken dial, which needs to be put back into place to be able to open the door.
For an exhaustive list of all known sources for this item, see here
If I must discipline just one more of my guards for forgetting the fort prison access code, I think I might just lock myself in a cell and sentence myself to life imprisonment. Better that than having to deal with this incessant incompetence. I know my vampyre locks are tricky for the simple-minded human brain, but security within this fort is paramount, and they're not THAT difficult to remember. Just review the current prison log and look at the inmate references. The code order relates to the ascending order of sentence (ignoring those prisoners still awaiting sentencing). Press the buttons in that order - see, not hard. Also, not particularly secure, but what am I supposed to do if I'm only given the empire's dregs to run this place?
-Custodian Stepan Jovkai
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