Maintenance is now under way and we've shut down our application servers.
The first step now for us is to apply the relevant updates to our underlying storage server, we can't do this while the applications are running easily without risking issues with the VM's access to the underlying storage so we're working through this now. Once that is complete we need to swap out the gateway device which has been causing us significant issues over the last couple of months.
We will later also need to make some cabling changes however this should all be on our APP-2 server and we should be able to get the site operational before we make these changes, it will impact our ability to run content processing but it shouldn't cause further site outages.