not exactly an answer here but i did find this much, if you intend to fix the UE Boom by yourself you do void the warranty, so if you have a warranty it would be better to have them replace/repair it for you. unfortunately i could not find a video or tutorial on how to replace the rubber
i personally have never done this but here is a link showing what to do . https://www.youtube.com/watch?v=IZeOrsYw... it seems relatively easy from what i saw remove 10 or so screws from the bottom of the laptop, then very gently pop up the top half of the keyboard, then unplug the 2 wires connecting the keyboard part to the laptop. it doesnt show him putting in a new one but basically reverse order. do this at your own risk i suggest you have someone who is a little experienced with you when you do this. edit: if the link doesnt work search this in youtube "How to replace keyboarad on Asus X550 series keyboard replacement"