Sadly the speaker is part of the battery assembly.
You can buy it on its own here:
http://www.ultrasabers.com/product-p/z-sound-aacombo.htmI had a battery blow and I just need to e-mail Deep back and get mine sent out for repairs for the same part.
I recommend doing the same just so you don't accidentally blow your board.
If you are confident in finding the right wires by taking yours apart you could tr it yourself.