thanks for replies I do have a foxwell nt510 now had done all the scanning with my snap on one , just waiting for the fault to pop up again and will scan using the foxwell as i cleared all the codes with the snap on one.

Yes mine to is the 6hp box am hoping to strip and rebuild the valve body of my spare so I can then just swap it straight over as my car is in daily use so need to keep downtime to a minimum, hence why I am hoping there wont need to be any coding or programming on fitting the spare.

Any pointers as to which parts to replace and from which supplier gratefully appreciated kind of only wont to go in there just the once.