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If it plays correctly in the lower octaves, then you probably have a bad key contact in that top octave.
The Oscillator circuit is usually a small collection of components near the tuning coil on the generator board for that note.
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Dirty key contacts are pretty common, too (see the cleaning procedure, below), and a bad oscillator pops up now and then.
Bad dividers are easily overlooked when testing, because if you have more than a few footages selected, they can be masked, or it will seem as though some notes just sound a little "off".
With the same tab on as previously, play each successive lower octave.
The first octave below the top octave (with the highest even footage on) is the first divider, the next lowest octave is the 2nd, and so on.