range rover sport 2.7td 2006 gearbox problem

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french dave

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My RRs has developed a fault after fitting a secondhand brake booster and brake mastcylinder. When putting the gearbox in to drive it will only drive in first gear. But shifted to sport it can go up and down the gears in manual. after about half a mile the car shows various faults HDC not working , gearbox fault. special programs not available traction control not available. But when this happens the car will then drive in auto? whne you turn the car off the whole lot starts from the top again.
here are some fault codes I took sceen shots of. any ideas on what is causing the issues? IE how to fix it
many thanks
 

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