History.
Garage managed to nick the rear shock / ram with a grinder, lost a load of fluid truck was down on it's bump stops, was also driven a couple of miles like this..
Replaced rear rams, one new one 2nd hand.
Bled 4x bleed nipples, nothing out of accumulator.
Then used the info you posted. Bled all 4x until down on bump stops, still nothing out of accumulator.
Started it up, green light on at N doesn't respond to H or L, green light flashes twice but nothing happens.
Drove around garden, off light comes on.
Back of truck is very high.
Now have this fault code. C1713 ride hight control sensor RH Circuit Malfunction.
Drinking tea now, scratching head..
db