Yes, there are shops who repair CRT monitors. They will need to know the model number. In some instances you can just send the circuit board.
Capturing pics of CRT images can be difficult, what I do is take a video on my phone from different angles then I play it back and do a screen capture when I see the anomaly best. That way you don’t get the half screen refresh shadow like taking a single frame picture. Be sure to reduce the file size to 1000KB or less by using a free app or email/text to yourself with image reduction turned on.
Chris