Fourtrak powersteering box and pump

Forum: 

I've got an mot failure on an R reg fourtrak. All OK but for powersteering. Needs new box and pump. Quoted about £600 to repair.
Has anyone had the same problems. If so what did you do about it. I can get a box and pump off a P reg... so wondering if I did it myself. If I did what are the problems Unknw