Can I replace the backlights behind the buttons?

Hi everyone, I've had a gs4 for about 1.5 years now and a few months ago I noticed that the backlight on the back key stopped working. The button itsleft still responds normally but the light doesn't turn on at all. This small detail is really aggravating me. I'm positive this isn't a software issue, and I've tried going through settings and all that. My question is if it's possible to replace those lights without having to replace the entire display assembly. It imagine it would be simpler and way more cost efficient

Please Help, Thanks