lumia 720 function keys light not working

Hiee all my nokia Lumia 720 function key lights not working i mean back button , windows button and search button lights not working even in dark place….what to do ?? I just took my phone from nokia care from the problem of,volume down button…the volume down button still not,working and now breathing i mean function key lights not working…please help..fed up frm NOkia

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nokia lumia 720 power button not turning display offnokia lumia 720 power button not turning display off

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