RCA Set with an Issue

[Console User]

I have a 1985 RCA Model GLR689PR Set. I think for it's age and etc. it still has a nice picture. It does have one issue. If I knew how to post pictures on here I would post a picture of a screen shot. I will instead for now describe. I notice when watching TV there is a small area in the top right top corner of the screen where the picture looks off. Like it will show purple color on certain shots, or can be darkened in that area with other screen shots. Is this a sign of the CRT aging and so call burning out in that area of the CRT?

Thanks for anyone that has any information on this condition.
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