I have an '07 Roadglide. Recently the display on the Harmon Kardon Harley radio quit working. The radio and cd player still work fine but the display is blank. When it first happend I turned the ignition switch off and back on and it worked for about 15 minutes. I has not worked since. Is there a cure? Perhaps a loose conection or has the display unit died? If so is there a good place for repair or swap out?