CDs won't eject from JBL Disc Changer System in 2010 Prius III

Yesterday I had three discs in my cd changer.
They were all playing fine but I was tired of listening to them so I put in a fourth CD.

I got a 'Check CD' message so I ejected the disc from slot four and ejected the disc in slot one.
Then I put the CD I got the 'Check CD' message on in slot one and it played fine.

I should've just left it alone but I tried to put the disc that was in the first tray into tray four.
I got a 'CD Error' message and now none of the discs will eject or play.

I can here the disc change moving and what I presume to be, trying to eject the discs but nothing comes out. The light blinks amber and after a short time the changer will quit trying.

Everything else works fine. I.e. FM, AM, SAT, BT audio etc.

Has anyone else had this issue?
I've seen some posts in which others had this problem and they disconnected the 12v battery briefly then tried again and the discs ejected.

Is this safe to try? If so could you explain or link me to a post that will describe how to do this?
I will take a video of the CD player trying to eject the discs later.

TIA.

 

Just an FYI for anyone who comes across this thread having the same issue I had and continue to have.

I did disconnect the 12v battery. That did eject the map DVD which has its own slot but didn't help with removing the CDs. That said, all four discs are still stuck in the disc changer and won't play at all. I'll mention it the next time I'm at the dealership.

If they want to replace the whole unit or try to charge me some ungodly amount to remove the discs, I'll just leave them in there and continue listening to music through USB or Bluetooth.