IPhone 5 Lock button not working, and i want to fix it myself?

So as the title suggest, i want to fix this problem my self. My question is, do i have to replace the flex cable that connects the volume/mute/and lock button, or just the physical lock button? The mute and volume work perfectly fine and i have no issue with it. The lock button simply doesn't work, before it took multiple presses jut to get the phone to lock, now it just doesn't lock at all. But the physical button does go down making the clicking sound.

So, do i have to replace the entire flex cable?

http://www.ebay.com/...&_from=R40

Or just the lock button?

http://www.ebay.com/...1154110686

I don't think anyone knows that answer to that. I do know that Apple wouldn't even fix it though, they'd give you a new iPhone 5. I'd suggest taking it to an Apple Store. They replaced my iPhone, for free, with the same problem.

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