Thanks for that, the dealer had sent me that as well but were asking NZ$202 for the Valve cover retro fit.
I've since discovered where the steering dampers are located and realise now that the left side damper is inoperative over the first 1" of movement so that will not be helping at all. The right side seems ok. They both appear to be a nightmare to access, the right side especially.
The information I'm getting from the dealer on what oil to use for the hydros oil change is quite vague. I can't send it to them because 250mi away and we have our own shop. The manual says a Toro oil but that is not available here. Instead they quoted a Total (French oil Co) Quartz 9000. I'd appreciate advice on an alternative oil from a better known supplier, like Mobil, Castrol, Shell, etc Please? cheers Gordon