You can change your service tools user ID password using STRSST.
To change your service tools user ID password using STRSST, complete the following steps:
If all passwords are typed correctly and your new password is accepted, you will be able to sign on with your new password. If your new password is not accepted, you might not have complied with the password policies for service tools user IDs. Review these policies and make sure you comply with them when choosing a service tools user ID password.