Conclusion for this thread: As I don't want to spent too much time with diagnostics (whats really wrong in the AT or not etc), or take the risk of just buying a used one, or an "overhauled" one, I bought a manual D2a TD5 today to get rid of the risk called "automatic transmission".
Good in the end: Now I have a car with less km, CDL, and without automatic transmission
Will swap the roof top tent, awning etc in the next days and will have a MY2002 TD5 AT for sale. Only problem: Just drives reverse and nobody knows how long it will does it

If any one is interested, please send an pm.
Thanks for all your help and advices! If I had more time, I would be really interested to open the gearbox and see whats happened.
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