Bariman
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I presume you mean High D as in palm key D w/octave? There might be a problem in the high Eb pad sealing, which would throw of high D, but wouldn't be noticed in any lower notes. Try slurring. If that dosen't work, take it to a tech, or break out the leak light if you have one. It's hard to diagnose the problem over the internet, so a live tech will be the best situation.
Bariman
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