My two guesses are :
1) Two (or more) parts are rubbing together and need to be separated or greased.
2) Something has fallen into that area and is rattling around (see OldGuyFla's comment above).
Either way, you're going to need to remove some covers and do a visual check.
IIRC, there is a service manual for verts that is not part of the FSM download on this site (see link in my sig). But the FSM is a valuable resource, so worth downloading and looking.
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