Its a VERY simple fix, you need to replace the wire.
Now, there is lots of info online about how to solder, and it is very easy to do, so I would say grab yourself a soldering iron, some solder, a small length of wire and some wire cutters. Here is a link to 'how to solder'.
http://www.youtube.com/watch?v=BLfXXRfRIzY
I would really urge you to do this yourself as it is cheaper than taking it to a shop, and over time it will do you good. I have rewired complete basses more times than I can count, and even rewired guitars a few hours before going on stage when my friends axe mysteriously stopped working. It is also quite enjoyable, and you can fix more problems in the future.