There are no default passwords to login to StorageGRID manager.
If this is regarding the StorageGRID management interface, you would need to open a NetApp support case and they can help you reset the password.
If this is regarding accessing the StorageGRID nodes via SSH, we do have a Passwords.txt file in the recovery package that can be downloaded via the StorageGRID management interface. This contains the SSH passwords for each node but it does not contain any login passwords for the StorageGRID management interface.
https://docs.netapp.com/sgws-114/topic/com.netapp.doc.sg-maint/GUID-9E96E7D6-F4B0-4F45-BA35-6883581B57B8.html