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Found this on another thread:
If anyone is still looking, there's a secret room. In the big room with the secret passages at the top and bottom, the secret room is in the middle. The entrance is at the base of a small room with a green filing cabinet and a small wooden sign with three little figures on it.
Also, YouTube has videos that might help you🙂
https://youtu.be/x-Ai1TwC5Rw