Preset button “Ethnic” doesn’t respond when I press it – nothing happens at all. I can get to the desired sound using Category Search, though. All other buttons are functional.
That is almost certainly an issue with the tact switch which is underneath the plastic button itself, and you’ll likely want to replace it. The good news is the part is cheap, and it is simple for a technician (or you perhaps) to desolder the old one and replace it with the new one. But it does require a lot of disassembly to get the panel board out.