An audit trail is available from the Account menu of the website.

The audit trail displays all changes to your organization account.  The audit trail tracks when each user logs in, when a device is added, changed or updated; and when a report is run and sent.

Clicking the info icon in the corresponding line of a change log will show you a table of all fields on the updated page.  The fields changed on the page are highlighted and display the old value and the new value.