Got my N900 back today, from second time a the service shop, now it is how it should be, tight slider, with minimum flex (or none at all), no dust, no dead pixels, man finally it is time to get real use of my N900.

This is what they swapped the two times it has been in for service, total of 22 days:

Slide Flex Assey
LCD AM 800X480 LTPS CO CAUCASUS N900
A-Cover Assey
Touch Window Assey N900
Screw M1 4x2.8 Black