please help with 3 amigos codes

Had the car plugged in today at the garage and was told the following as a result
pump failure monitering line
pump failure 3 pump sticking
shuttle valve failure
rear right outlet valve drive short to supply.
When the Amigos started they were intermittent then went permanant.
My Question is, do you think replaciing the shuttle valve alone will sort this problem or will it be a new (secondhand) pump/modulator?
Any thoughts/advise very welcome

Do a search, this has been done to death. If I remember well, there is a link somewhere that shows a "how to" repair the valve block to resolve the shuttle valve issue.

Thanks, have done searches and had a good look round, it was just that I thought someone might have had the same codes and known if just changing the shuttle switch would work or whether I was going to have further problems and whether I should just ditch the modulator and stick another in rather than waste my time with the switch