weird sound from x201 keyboard

recently i've found a weird problem with my x201 keyboard.
when i press down on the area where the escape key is or around the area where the volume controls are, it will make a plasticy click sound.the sound happens as soon as i let my finger off that part of the keyboard.
sometimes when i press that area and let go it takes a while for that part of the keyboard to bounce back up and make the sound.
so it sounds like that area of the keyboard stays in place for a while sometimes before it jumps back to the natural position.
no i've never spiilled anything on the keyboard.
i'm not putting a lot of pressure on that area either.
it could happen if i just tap that area of the keyboard.
and i've taken the keyboard off but couldn't see anything that could make the sound.
any idea how to fix this? is this a problem with the keyboard or the laptop bezel?

also will lenovo just ship me a new keyboard for free if i ask? what number or email address would i have to contact?

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