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This sounds like a common problem on all headphones in that a wire has become loose or there is a break in the wire - Now you could if you find the break fix it and if it's the connection then possibly a little soldering will fix it
Theres lots of way like an electrical tester or taking the earphone in question apart to check the wiring
Is coming soon on the global page, try to contact your local support to see is there any info for the release.
Try to check with your local Sony support once on the glocal page had launch it.