| Your post isn't entirely clear, but I assume your talking about measures 25-27 of the 1st trumpet part. My part definitely indicates a trill on this note.
Perhaps your complete part is from an older or rarely used edition. Are there lots of dynamic and/or articulation marks? The presence of such would indicate a non-standard edition of the piece that may have all sorts of suspect additions/deletions.
I'd suggest calling Kalmus and getting a part from them. They'll send you a part from the BWV edition, which is what you'll customarily see on auditions. The Magnificat in D is BWV 243.
In short, do the trill.
Best of luck!
Bob |