I believe the lock you're referring to leads to Kol the Heretic's secret room. Use the Heretic key on the lock. Inside you will find a statue of Kerath and some goodies. As for the chute, you can peer down it, but other than that, it doesn't serve much purpose, I don't think. If you're having a problem with dead monkeys, I suppose you could stuff a few down the chute to get rid of them.
Serath
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