You can use this search feature to locate many types of changes (with their reasons) that have taken place to a customer account or to a service number.
The search window is accessed from Applications > Customer Management > Change Reason History Search.

Performing a Change Reason History Search
From the Change Reason History Search window:
Enter as much information as you want in order to narrow your search.
OR
Enter nothing to return more numerous results.
Click Search to continue.
Note
Only results allowed by a user limit-to profile will be displayed.
The Change History Search results is a grid of matching customers/service numbers with self-explanatory columns describing the change.

You can right-click to filter the results or view the customer account. Or, you can double-click a row to view the customer account.