Blackberry 9700 Bold - Volume control wasn't working.
But it is now
My neice has pretty much trashed her BB 9700 so I took to giving it an overhall. It's just outside warranty so I popped the lid to check out various ailments (keys sticking. Battery intermittently losing it's will to charge, and general dings and bashes along with some water/beer damage)
Got it all working again apart from the volume up key.
Couldn't get the begger working. So took it all apart again and found that the "courtesy" button on the left side (which she never used) is actually the same internal switch as the volume buttons (up and down).
So I swapped the volume up for it and now we she can play her beloved 'muzak' at high volume again.
Funny thing is the left courtsey button still works :/