Chosen Solution
The keyboard I have is actually slightly different: It’s the A1243, but the magic keyboard was the closest available option. Even with keycaps off, and on two different computers (one mac and one pc), pressing A yields “AS” and “Q” yields “QW” Weirdly, “Z” yields “XZ” so backward from the others. And “1” gives me “12” I’m guessing it’s a hardware things. Short of totally pulling apart the keyboard, is there anything I can do or try?
Sadly, these keyboards are not easy to open and even still there is little you can do to affect a fix. Basically, the keyboard is a matrix of lines (X&Y) so the logic scans to see which cross points are shorted when you depress a key. In your case there is corrosion damage on the circuit board.
