Letter "N" in keyboard T420 is broken

[letanphuc]

I have bought a T420 for 2 months. Every thing is OK but keyboard. The letter "N" in my keyboard is broken nearly completely. It look not pretty and I worry about it. I am in Vietnam but my computer is bought in US. Can my problem is supported by Lenovo? Or are there any way to paste decal letter "N". Hope to see your help. Thanks a lot.

[MiRacL]

My "TAB" key was broken on my T400 and i bought a new one from here: http://www.laptopkey.com/
The plastic hinges on the key itself was broken, no the electronics in the keyboard.