hi
way I read it those struts are not the dampers, damping is done by the spheres, the struts are rams to maintain ride height.

I remember an uncle had an old Citroen with hydro-pneumatic suspension - but as they don't use rams, it would sink about 6 inches when the engine was turned off....bad news if you did it with a door open next to the kerb!

I believe the way to test your spheres is CAREFULLY probe the fitting hole with something small enough to fit in but blunt, and soft enough not to rupture the diaphragm which separates the gas and oil, see if the probe hit anything before the top of the sphere - if you can't feel it, its burst!

Never tried it though!

If the struts don't leak and do move they should be fine?
cheers!

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cheers!!