It is not unusual for a camera's sensor to have a pixel fail this way. Most sensors consist of 100's of thousands or more pixels that make up the sensor. Each responds to the color and intensity of the light projected upon it by the lens. It sounds like a pixel on your sensor has failed and is "dead" or "stuck" in a dark state. Pixels can fail "hot" on a single color, too.
The bad news is that it is not possible to fix a stuck pixel. The sensor itself is the smallest replaceable part and is often times not worth the expense of replacing. Compare costs of replacing the part vs the cost of replacing the camera and decide which way to go to be sure.
I did see some Minolta specific info that you might want to look at first here.
The good news is that there is software that will allow you to mask the pixel. Google search for "stuck pixel software" for a list of results. The software analyzes the pixels around the non-functioning pixel, and makes it a color that is far less likely to be noticed. Other software may perform functions that restore functionality to the pixel and others still that do something else. I am unsure of how well the former methods work or how long they might work. Software that changes the output file is the type I used and it seemed to work well. Each file needed to be run thru the software to make the change however.
Good luck!
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