I was listening to my Sportster Replay (in the boombox in my house) this morning, and all of a sudden the audio just disappeared. The display was still on, and I could change the channel, but no audio. I turned the unit off, turned it back on, and it stayed on Sirius bootup screen. I could press the menu button and bring up the menu, so I checked the serial number. No serial number was displayed, it was completely blank.

What is up with that? What can I do?