I started my position back in March. I have a direct that is known by pretty much every one to have some negative behaviors related to a harsh tone that makes many of the people she works with on edge because they are essentially afraid they are going to get their head bit off at any time without notice. When I started, I'd see these behaviors and address them directly with her. What I've noticed is that while I don't necessarily see the behaviors now, my staff informs me that these things are still happening, though it may have toned down a bit and they are less blatant.
How do I address negative behaviors that destroy the team that a direct hides from me, but I'm certain are still happening without it turning into a he said, she said conversation?