Detaching the PgUp and PgDn keys on an X100e

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OK, so I did spill some soda on my table last night and a couple of droplets made it into my ThinkPads keyboard. I've removed and cleaned all keys but the PgDn and PgUp keys, which I don't dare to remove because it seems they would break if I apply force.

How do I remove these keys? I can't find anything online or in the manual.

Here's the type of keyboard:
http://images.anandtech.com/galleries/7 ... yboard.jpg

Best regards,
David