I have a Genuine Land Rover Discovery Series 1 Workshop manual 1990-1994, under Auto transmission all it shows is the sump pan, control body and governer. There is nothing showing the insides of the main box, I was wondering if anyone knows why, I am a mechanic and have rebuilt many autos, but a genuine workshop manual is essential. Is there a separate supplement for the ZF Auto, thanks in advance, Regards Frank.