Chosen Solution
The volume (+) button of my Play:1 has lost its clickiness. It is still working, but not realiable and I cannot feel any haptic feedback like a click. Maybe there is some dirt or dust beneath the button. Is it possible to remove the volume buttons without disassembling the whole unit?
You will have to disassemble most of the unit in order to get to the screen/buttons. I will provide a guide below on how to do it.
Sonos Play 1 Screen Replacement/Repair