I'm new to flash/actionscript so I could well be wrong....
but, you haven't called the arrows by an instance name (the
scroll icon is called and referenced in the script by the name
scroller_mc) nor are there any button functions referencing them -
i.e. upBtn.onPress, downBtn.onRelease, etc.
I'm looking in the actions layer of main/symbol 1/scrollbox -
am I looking in the right place?