The box will not go into steptronic mode, I can push the lever over and it does display sport on the lcd, but when I let go it goes back to auto.

It drives as normal in auto, up until the 4th gear change is needed, I can also put it into 4th on the lever, but again when it comes to 4th gear change I get high revs but no speed, if I take my foot off the throttle and let the revs die down I have drive again in 3rd.
 
its done 68000, and to my knowledge the heaviest thing it towed is a horse box within the last 18 months or so, but before that I don't know.
 

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