if you fancy it, bring it along to my garage, ill tell you what it is for free!
No offence here Chris but as it's within warrenty I would advise the owner to get on to Ford area manager (can get details of another site) and let them "fix it"
As you have been in it will be on file.
If a car has to have repeat work for the same job the place gets grief so to speak and bonus's lost so keep at it!!
As it's gearbox related, does it go in gear ok? Does the clutch slip?