I have the same issue on the Plus I got from mcdermd. The a key doesn't really work at all and various letters get stuck repeating... so I may need to replace the few caps on the board. Looks like someone was prying at the a key as there are scratches on the metal around there LOL. A keyboard like this on ebay goes for more than the shipping I paied from mcdrmd! so ... definitely going to try to repair it.

Wiggling it, alcohol etc didn't help... I also cleaned the back of the board with soap and toothbrush.

I guess I may as well break down and get a solder station...