Maybe someone could help with a europlus datanetics keyboard. It's very clean however looks like it's been hot in the past around the connector. All keys work, except 9,U,I,J,comma. Sometimes 7 will post double keys 7B. I've replaced all those switches from a donar datanetics keyboard and same problem which makes me think it's something else on the board. I've heated the main connector solders and tried to clean them up. Probably difficult for anyone to help but maybe there's a common problem i could look for with the solders.