If more relevant information regarding a closed service request (such as the problem reoccurring), you can re-open it via the Red Hat Customer Portal at https://access.redhat.com/support/policy/mgt_escalation.html or by calling your local support center, the details of which can be found at https://access.redhat.com/support/contact/technicalSupport.html.
Important
In order to re-open a service request, you need the original service request number.