For all CS-MARS customers with gen 1 appliances, Cisco has formally announced EOL/EOS for the product line. You can find the detail here. I'd recommend talking to your Cisco account rep about replacement of the gen 1 appliance with a gen 2. The 2nd generation of MARS appliances have numerous enhancements to speed and reliability. I had a dialogue with TAC about issues we were having and it seems that the 1st generation of hardware (labeled Protego) had numerous issues due lackluster hardware. This is why Cisco created the 2nd generation of hardware outfitted with components that meet Cisco's hardware requirements. Lean on your account reps to get replacements for you 1st generation appliance if you had issues. TAC and the account teams know of the issues and are willing to help. Keep in mind that TAC cannot upgrade you to a 2nd generation appliance, only your account team can.