[Aryllos]

So I have a pair of Sennheiser PXC 250 noise-cancelling headphones, and somehow or other something got pulled too hard or something and a little of the wire near the end of cord by the plug got exposed, and now whenever I switch on the noise-canceller I get all this buzzing or feedback or something in the right ear. Is there some way for me to repair this (maybe some special interference blocking tape or something?), or maybe somewhere I can take it and have it fixed, or do I just have to get a new pair of headphones?
 
Thanks in advance!