Algorda

Bought an ES300 year 1997. The CD player had no CD changer so I bought one (original Lexus for the model). I inserted it a couple of times with the six discs inside and always marked "error 3" in the display (I put the discs labels down, as the manual says). I tried several times with no luck. Then I charged the changer with just one CD and pushed it in. Same results. But the problem this time was that the changer got stuck inside and I cannot eject it. When I press eject you can hear the noise of the action but the changer dos not come out. Any help with this? I'd like to avoid going to a not very reliable audio car dealer and get charged a hundred bucks for a simple mechanical problem. Thank you for any advice or help you can give me.