Casio FX-CG50, Buttons are not entering numbers.

I have a Casio FX-CG50, and I have been using it for a year now. Currently for some unknown reason despite multiple cleanings inside and outside, the middle numbers, the decimal, 5, and 8, do not work. I did have some battery acid leak but I cleaned it enough to see no damage. Is it repairable or will I need to get a new one?