I have a 2005 Lexus LS 430 with the Mark Levinson audio system. Recently I have an issue where some of the buttons will not work. For example, I cannot eject any cd's from the changer nor am I able to advance forward to the next disc using the disc forward button. I can however go backwards to previous discs using the same disc button. It functions one direction but not the other.

The AM/FM buttons do not work neither does the search button. The cassette buttons do not work and will not let me eject, etc but the cassette plays fine All radio functions work from the navigation screen and from the steering wheel controls. I have replaced fuses but still have the same issues.

Any suggestions? I am at a loss.