Hello @ShelleyC371 ,
You can view recent (within last 7 days) contact exports via your Import / Export Activity Page. However, there's no indication of whether it was triggered by the account owner or an account manager. There's nothing that'd show for list membership changes.
If you're concerned about one of your account managers doing improper things in your account, we'd recommended you deactivate all of those users until you've handled the issue internally and can reactivate the ones you want.
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