Get Machine Blueprints Associated with a Service's Catalog Items

In our vCAC we have a service with catalog items that provision vSphere VMs via template cloning. In a vCO script, is there a way to get the blueprint objects associated with each of the catalog item objects in our service? If so, can you provide code to show how it is done? We have vCAC 6.1 and vCO 5.5.2.Thanks!