Hi, I live in France, and I have today joined this forum, which I have to say, I find impressive. I bought two years ago C5 tourer 2010. I have a nagging problem with the automatic gearbox, for example; I drive on the motorway up hill, 6 the gear drops down to 5th in to safe mode. Three signal bongs are heard, sign on dashboard gearbox fault, service, and display of gearlever positions I had changed the correct fluid = no different. I bought from Poland a second hand gearbox (from an accident crash 2000 Euros) only about one year old, had it fitted, same problem arisen, changed both drive shafts, since vibration had occurred, now cured. I bought four new correct type Michelin tyres. Both the drive shafts and tyres did slightly reduce the problem. But the problem persist, the slightest resistance a little more peddle, three bongs. I drove 650 kilometres to the South of France pulling a small single axle trailer, 'bong bong bong' so…drove in manual mode. I am not completely convinced at this stage that it could be 2 electro valves. but I am willing to try anything. I was in Manchester last year for a holiday, called in to the Citroen garage and left the car for three days, paid £120 quid diagnosis report. Citroen could only find reported codes, they proposed I should buy a new gearbox £10.000 + fitting. 'Well… of course I didn't'. If anyone can help, I will be most grateful. Are there any sensors that I should look at, if so how many, and where will I find them? And finally has anyone have a workshop manual in English that anyone could send me, my email address; darrell.hughes@orange.fr Thank you in advance.