After both the rubber conductor pad and the button is removed, it is crucial that an inspection be done of both components to confirm the issue.

The rubber conductive pad should be inspected for rips, tears, or loss of the black conductive material in the 4 locations the buttons would press them to the circuit board

The troubled button should be removed and inspected for damage, It should be noted each button has 4 plastic splines that guide it into place in the controllers cover.

The button has a cylindrical piece in the center that presses against the rubber conductive pad.

After identifying and replacing the damaged component remember to confirm the button layout prior to reassembly.