Right Dpad issues - despite repair.

Hoping someone might help me troubleshoot here. The right button on the D pad requires significant pressure to work.

The D Pad itself was worn down so I assumed this was the problem initially, and replaced it.

This didn't work, so I checked the metal domes that make contact with the board and the one on the right had a couple of very tiny chips in it (I assume from the damaged d pad plastic), so this was the next obvious thing to replace as it might have created a bad connection. Ensured to heat the replacement up to ensure it sticks properly. Before doing this, I cleaned the PCB under it and everything looked fine.

I’m stumped - can anyone else recommend anything that might be causing this?