I haven’t replaced a fader bank on the DLive system, but I have on the Avantis. It sounds like there is a similar scenario where there is a solder pad that must be linked together depending on which side of the bank you are replacing (left or right). I would suggest that you look again at this solder pad and make sure the correct pads have been linked/soldered together and that the solder connection looks good. You might even make sure there is continuity across the two pads to ensure the connection is good.
That error code is similar to the code produced by the Avantis system when this process hasn’t been completed properly. I know from experience! 😉