Pseudo Admin Role
We created a customized application support security group (Pseudo Admin role) which excludes the accesses of cube view form input, JE create/post and user security provisioning. This is required by...
Forum Discussion
Not sure what "CAT" is, but System Diagnostic is a Marketplace solution. Access to that will be governed by the Access Group set on the Maintenance Unit and the Dashboard Group (and the Workspace, in versions 7.3+ and if not in Default Workspace) that contain its Dashboards. Check on the Dashboards page, either in Application or System.
If that doesn't work, or works partially (e.g. the user sees the dashboard, but it doesn't load properly), it's possible the solution itself is doing some check in rules, which might be hardcoded to Administrators. In that case, get in touch with Support.
Thanks! Already connected with OS Support. They will assess and get back.