thanks for the website you recommended. i just found sth probably useful for my t40:
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I just almost fixed my T40 with a loose GPU.
The trick is to get something stocked between the GPU and the keyboard. So when you tighten the keyboard screws under the trackpoint buttons it will make a firm pressure on the GPU.
I added a little aluminum cooling profile on the GPU - and fixed it with some cooling paste. On top of that I added enough post-it stickers to make the pressure on the GPU when then keyboard is back on.