Are you saying the space key (or some other key) is mapped as ";", or, that ";" appears randomly in your typed text?
As you know, the A600 keyboard has no intelligence on the key side of the ribbon cable. There is a simple matrix under the keys and keystrokes are interpreted by the circuitry on the MB. Could there be an intermittent connection (contamination, bent pin) with the new accelerator? Did any other chips get moved or disturbed during installation?
Before I understood the clamping collar (lift the collar to unclamp the ribbon) where the ribbon cable connects to the motherboard, I damaged a ribbon. Later, it was easily repaired by trimming a 1/16 of an inch from the end of the ribbon (so the connector would "bite" in a fresh location on the ribbon when reconnected).
I would not attack the keyboard with alcohol unless a particular keystroke fails to show on the screen, and maybe not even then. I have never seen a failing key made reliable by cleaning it. Maybe someone else has had success with this.
