Some guys here do it themselves. There are threads if you search, or I'm sure someone will be along with links.

I can tell you that to do it right, the HPO pump has to come out, and both valve covers have to come off. You tell me if that is a hard job. I don't have the kind of time this would take, so mine is in the shop right now for the same issue.

Ford quoted me "about" $2,500 to do the pump fitting and standpipes on both sides. They didn't get the job.