I've just fixed mine this weekend.
You can take the stalks apart in ten minutes so long as you've got a 24mm socket (I think thats right IIRC) to take the steering wheel off.
To fix mine I just really carefully cleaned all the metal cotacts on the stalks with WD40, and all the wire connections, then cleaned the contacts on the wiper relays (in the fuse box). Then lubed up the moving parts.
You could try that first, then if they still don't work buy some replacement stalks off ebay.