tubes or circuitry?

my 65in JVC AV65WP74 color are messed up it think the blue tube might be going out . When I open it and look at the picture on the tube is distorted the top of the tube has a black curvature at the top the you can see on the main screen.But heres the weird thing after looking I put it back together the screen went back to normal and a couple of minutes it went back to messed up.So I was wondering if anyone had that problem and is it the tube or the circuitry?

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