OK here we are: it works !
1- Check the oven temp sensor: 1100 ohms ! Good!
2- Numbering and remove 17 wires from the board
3- Dismount the board and visual check
4- Find new capacitors
5- Unsolder the 2 capacitors. Check with ohmmeter: the larger one give a bad answer !
6- Put new capacitors in place
7- Put board in place. Plug the oven.
8- Enjoy ! No more humming sound, everything works fine !
Thanks Scrapiron! You're a master!