Do you get any evidence of life when you press the reset button, such as switching between the A meter and the B meter? Or does everything just sit there? I've found on my 03 that I'm having to push progressively harder to get anything to happen there. I'm tending to suspect some sort of slow warpage, shrinkage, or the like. I'm not sure whether the button that protrudes from the panel is indeed mechanically a part of the switch or simply bears down on the switch. In which case a thin shim in between might do the trick.
Sorry not to be able to give you a more specific answer. It's a problem that's looming at me but hasn't quite gotten to the point of having to do something about it quite yet.