2002 x5 3.0l petrol gearbox

[Rob Faure]

Goodday lock-downers,
Gearbox issue with my baby!!The car was driving great with smooth gear changes,kicking down and quiet. I stopped to help my buddy with his boat and approx 1 hour later started the car ,put it in D and there was nothing!! I could see the fwd drive shaft turning but does not move the car in auto or manual. There is ATF in the box but with the car not level I could not ascertain the level.The car rolls backwards/forwards irrespective of where the gearbox is and even in 'Park'
With our lock-down status I cannot get a reader for fault codes.
Has anyone an idea of why this occurred and any way of tracing the fault- spare parts are not available but I have 3 weeks to "play" with different ideas.