If I'm not completely wrong, you might be able to unlock it with your thief, or use a 'knock' spell. If it isn't that, try the levers in the levers room. (turn them one at a time, and when the message reads 'a door has just opened', leave the lever you're on and try the next one. There are eleven levers in total)
If none of this does any good, please let me know as soon as possible, so I can check over the weekend.
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