Hi @michael87532
Here's a teardown https://www.youtube.com/watch?v=tMRIADrsVxg|video] that may help.
If the actuator(s) on the button are broken, search online for the following part number depending on the colour of your phone:
mystic black = GH98-45543A
mystic grey = GH98-45543B
mystic white = GH98-45543C
mystic bronze = GH98-45543D
mystic green = GH98-45543E