emeraldgirl08: There is actually no problem with keyboard itself. It works fine, but doesn't fit / match well to the basis.
dr-st:
It almost sounds like the keyboard is not seated properly. For starts - this:
I have to study a lot more. This is exactly what I wanted to say

Yes, you have understood it well. When I seat (is that the right word?) the keyboard into the body and snap everything right how it is supposed to, it doesn't match right to the body.
Keyboard elevation problem is connected to this. Remove your keyboard and make a look how the keyboard holds in the body:
At the top: keyboard is retracted under the long, plastic bar.
On sides: nothing
In the middle: two screws
At bottom: keyboard is snapped under the palmrest.
Conclusion: keyboard holds (except two screws) only on plastic parts. And this is the problem. Flexing plastic parts tend to become looser in time.
When I tried to fix 'loose' keyboard at the left top corner, I failed. In this place is only free space between keyboard and fan, so I don't know how to solve it.
I fortunately found temporary solution.
Look at this picture:
https://www.replacementlaptopkeys.com/i ... op_key.jpg
When you take closer look on the Escape key, you will see black part, that is slightly above it. As far as we know, this is the place where the keyboard is retracted under the playstic bar of the keyboard bezel (below left hinge). I stuck there few pieces of the electrician tape. Now, when I retract the keyboard under the plastic bar, there is no free space and the keyboard is pressured down - right as it should be! But, tape is still only tape. When laptop heats, this area becomes quite loose again, the glue propably gets too warm.
How would you deal with it? I am desperate. I haven't faced any similar problems on T30 and T41
Thank You!
edit: This video describes well my problem. The difference is location: in my case, problem occurs mainly under Escape and neighboring keys.
https://www.youtube.com/watch?v=nVEwSm-PknU