You can get rid of the ERR-message;
-> By loading an another CD, and let the player to play it and then change back to the CD that gave the error
-> Changing the CD selection to another slot, and let the player to play it and then change back to the CD that gave the error
-> Ejecting the CD that gives the ERR and then loading it back
I have got ERR messages thousand times, but I've always fixed by doing some of the steps above, so I am 82.7% sure you won't need the stereo replacement.