The keyboard works fine in every area, but about 10 keys go up and down, but do not play. They stoped working shortly after we bought it new.

I would complain to the manufacturer, or take the unit back and try to get a refund/replacement. Some types are rubber sensors, and they can be cleaned if you take the unit apart. Not knowing the make and model, I can't give you much specific information, but here is a neat website that explains how to fix different type keyboards:
If you join this site, you can download the service manuals, and then figure out how to resolve this. Here is the site:
http://www.ehow.com/how_5898931_fix-piano-key-electronic-keyboard.html
Good luck, hope this helps, and thanks for using FixYa.