Reset Mazda5

I have to end at the Mazda dealership to make reviews because there is no way to remove the 20,000km maintenance witness, does anyone know how to do it?
Thank you

In that model I do not see it but try this.

You must have a button in the velocimeter (trip) or some of that. You leave it pressed and give the contact with the key <- without starting, you expect 10 sec and remove the contact, it burs it to put and start to see if it has been solved.

Comment when solutions to whether we find out the others