I have three trombones playing this exposed fanfare. I don’t consider the sustained Ab4 too high and Dorico does not turn it red. That said, brass forums seem to disagree about the highest playable note for a tenor trombone. Do you think this is too high to hit and sustain?
Dorico is correct, the A♭is inside the range of a tenor trombone.
Consider that in Ravel’s Bolero the highest note of the trombone solo is still a fourth higher (Db5) .
But it depends also on the skills of the player. For professional players it’s no problem at all. However amateur trombone 3 players often are not used to play that high.
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Thank you, @Vadian!
By the way, 3rd chair could sit out on this phrase, if needed. 