According to the administrator here http://forum.buildmillenniumfalcon.com/forums/topic/leias-maintenance-room/ There will not be an included side room at this location.
I may be off my rocker, which is not uncommon, but I found this today and thought that was it:
http://forum.buildmillenniumfalcon.com/forums/topic/the-millennium-falcon-build-diary-issue-26/
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My bad. It's the gun turret access hallway.
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