Have just changed the server machine but now when attempting to manually create a dwg or pdf the options aren't there, which file do we need to copy across from the old machine for this to appear?
Do you mean the powerJobs button in Vault?
Are you using powerJobs v20? Unfortunately this is a known issue in powerJobs v20.
As a workaround for this you could use the free qjob app.
This app lets you add buttons to the Vault context menu that queue jobs.