Just done mine and it's not too bad really.
Remove the front fret. Then loosen and remove the screws holding the top section where the tweeter is located. Then gently prise away the the section from the speaker, it will be tight as they are slightly bonded. I managed then to get in with a torque driver without actually removing the section completely. There is just one small screww in the middle. Once removed again the top plate has double sided tape holding it in place, pull away gently but firmly. Simply reverse the process.
Hope this helps.
Jonnie