It occurs in the solo in Movement 4, "The Brisk Young Sailor." The highest note in the solo should be an Eb, not an F, as notated. It only occurs in the 2010 Fennell edition, in the bass clef baritone part. I think it is correct in the treble clef version. In any case, the highest note of the solo should be a concert Eb.
Kyle Aufderhar
1982 Besson Imperial 767 euphonium (Giddings and Webster Carbonaria)
1966 Salvation Army Triumphonic baritone (Doug Elliott, LT 100 rim, F cup, F3xs shank)
Lafayette Concert Band
Acadian Wind Symphony
University of Louisiana-Lafayette Wind Ensemble