Thanks for the ideas! I went back this morning and tried to get a closer look at the changer. It looks like the #4 disc holder was still in the "read" side of the changer. I tried pushing on the mag while pushing the eject button. What was weird was that it pulled the #4 holder into the mag, then it went back to the stuck position. This happened a few more times, but it finally ejected with all the discs in place. I only use pre-recorded CDs in my changer, and they have never caused any problems. I guess if it keeps happening, I'll take it to the dealer and let them mess with it.
01 Red L