MY cvp 303 when in acoustic voice has several notes that are distinctly sharp.T
Your description of "acoustic voice" causes me to think about stretched tuning.....
http://en.wikipedia.org/wiki/Stretched_tuning
This youtube has a very good explanation of acoustic piano tuning and the reasons why they are "stretched":
Have you tried a factory reset?
That's usually the first step of a diagnositic.
Gary
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