The preliminary report of the german accident investigation authority is published ( only in german ):
http://www.bfu-web.de/DE/Publikation...ublicationFile
No signs of hydraulic or engine problems, but the T/R driveshaft was damaged/ interrupted at the fwd flexcoupling just aft of the engine. The rest incl. the T/R itself was undamaged, even the soot on the blades was not washed away, which could lead to the conclusion, that the blades were not turning properly on impact. Fuel lever was in flightposition.
Also no life vests and no survival suits were found on board.
skadi