Help with Sony monitor that is acting up

I bought a used Sony PFM-500A3WU plasma monitor about a year ago. It worked great for a while, but now the picture goes dark after a few minutes and the control panel flashes – most of the time the picture comes back on after a few minutes. However, it is happening more often and sometimes the picture doesn’t re-appear. The error code is 12 : 22. Is this something that can be fixed for a reasonable price? Any advice?

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