Having a CD Cassette problem. Radio works fine, CD also until a few months ago. When I switch to the CD player, I can see a CD running, can jump to another track, and all this info appears on the display. Believe, but not sure, what ever reads the tracks on the CD is not reading them. Does anyone know if this can be fixed, or does the whole cassette unit have to be replaced? Any help or suggestions would be appreciated. Thanks ceb