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If top and bottom stretch are equal relative to the center line and there is no vertical underscan as it appears in the pictures then the problem is probably too much width (aka excessive horizontal overscan). Other possibilities: vertical section used to have excessive overscan that matched the horizontal (but no longer does), or if your using a digital signal source like a cable/sat or DTV box that the box is sending a distorted image signal to the TV.
Is that picture of the current problem or is it from before the problem manifested?
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