What places fix over-ear headphones?

That awkward guy

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Jan 7, 2016
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So I have these Monster DNA headphones and I can only hear one speaker work at a time, if I connect the aux cord to the left speaker, I only hear the left, if I connect it to the one on the right, I only hear the one on the right, anyone know if I can get them repaired? If I can, where will they repair them, and how much would it cost?