Hi there, I own a T400 and the lid latch broke recently. Its kind of hard to explain, but when the lid is closed and I press the latch on the right side to the right, the latch on the left side doesn't get moved. I have to used a paperclip and push the left latch to the side to open it. Usually the two latches would be connected.

Any ideas or feedback about this issue?

How do I go about doing this?

do you have warranty still???

The hardware manual for your laptop is here. 

www-307.ibm.com/pc/support/site.wss/MIGR-70069.html

it would show you which part you need to change if you don't have warranty.