Has anyone tried to rebuild one of the hydraulic units for the 4WD? My relay in the trunk has been clicking and I'm thinking the accumulator PN 41610-20U00 has lost its charge. I have heard of them being replaced, but looking at it I don't see how its done. Before I want to do that I'll bleed it and test, but Im curious if anyone out there has had success. The Aussie Manual says that the unit cannot be taken apart, but I have a part number index for the unit that shows it dissasembled.