This problem has been ongoing in the Disco 3's for a long time now and hundreds of people are complaining about the exact same fault. I called Land Rover S.A Customer care on 0860 110 090 and spoke with Amanda there and laid my complaint regarding Land Rover replacing my actuator as a recall item.
problem is that the auto box relies on lubrication supplied by the oil pump which is driven from the input shaft if the engine does not turn, there is no oil pressure in the box and if the props are still connected, the gearbox is driven via the wheels short distances very slowly is ok but safer to either put on the back of a rollback or remove LT77 – Automatic Transmission Fluid (ATF) LT230 – EP90. R380 – MTF94. LT85 – 20w50. LT95 – 20w50. Whilst changing the oil in my Land Rover Gearbox I noticed that the Main ‘box was low on oil but the Transfer ‘box was overfilled, why? It is very common for the seal between the Main and Transfer ‘boxes to fail.