You know I was thinking that the buttons would be the issue also, but I have checked all but the driver thumb controller. I started by completely replacing the faring display unit with another one (that should not have the same button stuck) and then by disconnecting the rear passenger unit and trying to get the channel to change, either way no response. I am thinking that the rear passenger and driver only have a search button for the radio and no presets so worst case the channel would keep changing if the other controllers had a stuck button. I will check the spikes in the dash connector with an ohm meter and see if there is any chance the contacts show a reading, I am doubt full on this as the entire tunning input unit was replaced, but hey, I have seen weirder.