Having just ripped out my failing Xreas and replaced with Dobinsons at 67k miles, I learned a couple things about the system. There are double check valves near each shock that you can disconnect. I didn't lose any fluid through those. If you want to completely remove the Xreas and replace with a new one, I don't see any way to do that without removing at least one check valve. The lines to the front go through the body mount and I could not figure out how to get them through there with check valves in place. I did lose some fluid removing those to fish them through the mount. The dealer likely knew that and chose to disconnect the check valves and replace the shocks and reconnect to minimize fluid loss. Replacing everything would have ended up with less fluid than you have now