Casio ctk -1000 key repair

[Guest]

I have a Casio CTK-1000 keyboard and two of the keys have been pulled up and out of the guide it is supposed to ride in. The keys are still attached but will not go back down into place. I am afraid of forcing them in fear I will break the plastic part of the key that holds it in place. Can anyone tell me if there is a way to pop those back into without removing the cover? If not is there a way to get the cover off without removing the 20 some screws on the bottom?

Thanks for any help you can provide.

[jts1957]

http://elektrotanya.com/casio_ctk-100.pdf/download.html

Here's the service manual. There is an exploded view in it that shows how it is put together.
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