Long story short the keyboard was spilled with coffee with cream and sugar and now most of the keys could not be pressed. I removed the 14 screws that I saw underneath even the hidden under the tapes and the warranty stickers but I can't open the keyboard. On the upper side something is holding it where the multimedia buttons are. I used a butter knife but if I force it a little more I fear I may brake it. I read on other board someone did exactly that but no solution was given at the end.