I got tired of waiting for Kawasaki NZ to get a new speedo unit in so I took my one apart and squirted a small amount of CRC into the switch units and pushed them in and out a few times. Put the unit back together and the button is now working. I wonder if some moisture had found its way into the switch and the CRC cleared it. Two weeks on and all is working well. Four weeks on and still no warranty replacement arrived yet. When it does I will keep it as a spare in case my repair doesn't last.