My right earbud has no sound even if connected to the left socket so it is the earbud not the cable. Having bought these from a reseller on ebay a year ago I am afraid my warranty will not hold. I am a diyer so has anybody any idea if opening them and fixing the problem is possible? I have already tried cleaning the socket and no amount of jiggling brings any sound. I do not remember abusing them in any way so it is strange.