Q: Renew my code sign certificate?

I run a Mavericks server that serves profile manager, file, and time machine services. My code sign cert expires in a couple weeks. When you go into Server.app > Certificates and double click on it, there isn't a "Renew" button like there is for other certs I've renewed.

How would I renew this? And what impact would it have on my running services (ie. would I have to re-enroll everyone in profile manager)? Thank you.