Bump question

If I sent in a nice older card that is a PSA 8 but think it could get bumped to a higher grade, is it possible that they could regrade it to a 9? Or if they felt it was better than an 8, would they only give it an 8.5?
Is it possible to get a full grade bump when submitting the card for a regrade in its original holder?
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Comments
Anything is possible but getting them to change it from an 8 to a 9 would be like them saying they made a mistake before and PSA dosen't make mistakes.
Cool Icon by the way!
A's World Championships-1910, 1911, 1913, 1929, 1930, 1972, 1973, 1974, 1989
A's World Championships-1910, 1911, 1913, 1929, 1930, 1972, 1973, 1974, 1989