issue with picture..help please for repair

Hi, i recently aquired a sony 52" rear projection tv model "kpr s53sn1" is seems to go ok except sometimes the top of the picture becomes curved and the red colour becomes out of focus or shows as a seperate image, this only seems to happen around the sides of the picture, everything else seems to be ok, p in p is there etc, any help as to how to fix this issue would be much appreciated, thanks in advance

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