/vr/ - Retro Games

I've had this CRT for a few weeks.
However, the geometry isn't exactly the best (although I can still stand it) and the screen seems to have blue lines at the left and yellow ones at the upper right edge. What do you think is the reason behind this problem? And can it be fixed without having to get a technician to repair it?
The model is apparently a Sony KV-25FS120, but outside of having its magnets made to work in the Southern Hemisphere it's a KV-24FS120 produced in May 2004 .
inb4 flat crt