Electronic Musical Instruments
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Hello, my name is Rusty. Sorry for the delay, I've been working in the field.
You can remove the keyboard assembly fairly easily. Turn the keyboard upside down, and remove all of the screws from the bottom. Now remove the screws on the sides, and you'll be able to flip the display up to expose the keyboard assembly screws. Remove the screws that hold the keyboard assembly in place, and be careful not to disrupt the ribbon cables, as they are old and are easy to crack.
Inspect the sticky keys, sometimes they break, and need replacement. Use DeOxit (you can buy it at electronics stores, it's like WD-40 for electronics) to lubricate the keys, and restore the action.