Thanks for the information you provided. Since you have changed the Cloudera Manager credentials, it is possible to update Director to use the same, which should restore access, and have the health show up again.
On your Director, navigate to the status page for the deployment, i.e. for the CM. On the right there is a drop down menu, click on "Update Cloudera Manager Credentials". This should pop up a form where you can save the new credentials for Director. After a bit the health for the cluster will show up...
Hope this helps,