I found this if anyone is interested:
Disconnect power, not turn off disconnect.
remove rhs front cover.
uncap heads using tool supplied.
move head carriage to left slightly
remove plastic head cover.
remove damper holding plate.
remove clear cover that covers head circuit boards.
~~procede with caution as to avoid spilling ink on head circuits~~
i ussually remove a damper by placing a large flat screwdriver between its base and the head manifold and then gently twisting the screwdriver until the damper becomes loose enough to lift out with fingers.
manifolds can be fragile so again take care.
i usually hold the damper (if it reaches) over the spit pad near the
wipers just in case.
undo the brass nut and make sure the little rubber o ring stays on the pipe.
take off damper and then refit new one. ink will be drawn back towards the cartridge.
refit the damper taking care when fitting onto head manifold as again these are fragile.
re assemble parts in reverse order leave rhs cover off for now just trigger the sensor with something.
recap heads.
turn machine on and go menu-ink control-fill ink.
when you see the ink come back through the pipes and into the damper press all 4 of the arrow keys together. this will then stop the fill ink cycle and save you some ink.
P