I just did this repair. You have to use a soldering iron to melt the three plastic posts on the mute button. The posts need to be melted while you hold the mute button flush against the bracket with a pair of tweezers. Make sure the posts are melted all the way down to the bracket so it stays secure. Also, be sure not to allow the soldering iron tip touch the mute/volume flex cable. Cheers!
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