Hey,
People tend to appreciate it if you say thanks and like their solution 
You haven’t shown me any of your code or your graph, so I don’t know how best to help.
In future I would recommend creating a new post and linking to this topic, rather than reviving one that is a couple of years old.
You could then show us your workings and upload files, which allow us to test a solution before we give it to you.
That said…
If you click through, it tells you that ServiceId is a property of the FabricationService…
So hopefully you already have the Fabrication Service and can either feed it in with GetParameterValueBy Name node, or python something like this?
serviceId = FabricationService.ServiceId
As I said above, I can’t test this code as I don’t have any test files to work with.
Hope that helps,
Mark