With the new @HighScoreSaves DK Multi coming out soon, I figured I would raise this one from the dead and see if anyone ever fully figured out how to cure the siren...
I think 5L is responsible for the sound Decay. There are also caps and resistors in that circuit (c26, c30, r35, r38, r47, r48, etc).
It's been a long time since I worked on my board with this issue (nov 2018), so that's my best recollection, but I'd start there.
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