Thanks for your answers!
@JAZZCNC maybe if you take some English ales with you ;)

I just begin to check the circuit. By now, tracks are surprisingly good, but there is some strange connections... I will continue to test the circuit.

I checked the part in china but you're right it will be difficult to replace it with the same model.
It would be awesome if you could advice me :)

A good shop in Switzerland is Distrelec. I've searched for some replacement parts (http://www.distrelec.ch/search?q=iGB...=4&pageSize=10) and I think about this one maybe: http://www.distrelec.ch/fr/igbt-to-2...=50&simi=97.47

Should I replace all IGBT or only the broken one ?

Thanks you, all for your help.