The rack won't move more than a 1/16"
I pulled the drain plug and a very dieselly mix came out... felt like a light oil, rather then the engine oil that is supposed to be in there.
I have put new oil in, liberally soaked the internals in releasing oil, yet nothing.
I did plan on pulling the top of each of the cylinders. There is a knurled nut that can be undone beneath each fuel union... but they are too tight to undo in situ. Its a shame, as I might then have been able to remove the check valves and tap each cylinder to free it up.
Here's the offending article