There is a wardstone on that level which you haven't found yet, located in a room on that level that you haven't found yet. You don't need to fiddle with the door-switches, at least not that I can recall. Just send your Thief around, WATCH FOR TRAPS, and keep an eye peeled for hidden doors.
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Volothamp's Comeuppance
Everything you ever needed to know about the entire Baldur's Gate series......except spoilers.
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