In your picture you show the problem at the top half of the right hand side only, is this really the only place the problem shows up ?

Also, where the problem occurs, do you get "Colour Mis-match" in other words with Black & White bars as shown, do you also see some colour around the problem area, if so then you may need to have your tube manually degaussed. Assuming this fault has only recently occurred, then it could also mean that your automatic degaussing is not working. When you first switch the TV on do you hear a sudden hiss for a second after switching on, then this is the degaussing working, if you do not hear it, then this could be your problem.

If the problem is the degaussing circuit, then the problem can be quickly fixed, but to be sure we need to understand more about the "Problem Statement"

Thanks for your input, Keith!

The curving is getting gradually less and less apparent from right to left. I drew up the black bars to illustrate how the picture looked when i display 4:3-content on my xbox.

I bought the tv earlier this year, and i think the problem has been there all the time, I just haven't noticed it before recently. There is no color mismatch as far as I can tell. Just the curving.

I cant remember hearing a hiss. I have to wait until friday before I can find out. I'm in the middle of moving to a new appartment and the avant is in storage.

I'm not sure if i can hear a hiss when i turn it on. Theres a "booong" sound and then just the normal crt sound. Very loud crt-sound, but it has been like that ever since I got it.