Instance Refresh and find hardcode instance like : NA65, CA38 in entire org

 

To find hardcode instances like NA65, CA38 in the entire org. 

Need to check below in components and follow reference links :

1. Static Resources

2. Custom Button or Link (Javascript)

3. Email Template 

4. Remote site settings

5. Visualforce pages

6. Custom lables

Reference links:

https://help.salesforce.com/s/articleView?language=en_US&type=1&id=000335670

Lightning Experience Configuration Converter: https://lightning-configuration.salesforce.com/

Pre Instance refresh checklist: https://help.salesforce.com/s/articleView?id=000335655&type=1

https://www.infallibletechie.com/2018/09/things-to-consider-during-salesforce.html