Hi Carlos,
SPOILER
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If I remember correctly, you have to go down the well, find Corona's briefcase, open it, take out the tape, use it in your walkman, and you will have the code.
A Really big spoiler:
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In order to get the combo for the briefcase, you must talk to the maid about the "gala event", she will give you a card. Look closely at the card, and you will get the combo. You will find the walkman in the multinational conference room. The batteries for it are found in the exercise room (I think it is the 2nd floor from the utility elevator) in the exercise bike machine. Good luck.
