Can't seem to find guide
Here's the headphone jack on eBay
https://www.google.com/search?q=asus+rog+gl551j+headphone+jack&client=safari&sa=X&hl=en-us&biw=375&bih=559&tbs=vw:l,ss:44&tbm=shop&prmd=svin&srpd=7653405119470346971&prds=num:1,of:1,epd:7653405119470346971&ved=0ahUKEwiW4dfKovnVAhUmzIMKHdJtBYsQgjYI3QI
And speakers
https://www.google.com/search?q=asus+rog+gl551j+speaker&client=safari&sa=X&hl=en-us&biw=375&bih=559&tbs=vw:l,ss:44&tbm=shop&prmd=svin&srpd=1012983339471855508&prds=num:1,of:1,epd:1012983339471855508&ved=0ahUKEwiGzKf2ovnVAhWTyIMKHQplBLYQgjYI0AI