and here is the side facing the flywheel. We don't see very well for the quality of the picture (it's an iphone and not a camera sorry) but the varnish is turning black and chipping away.
Now the exhaust cannot be eliminated either because what is actually completely charred is the connection between the ending of the winding and the external wire. This part passes below a bracket in the cover and thus is in contact with the aluminum cover. Now hopefully we'll see when we unwind this part if the fault was electric or itjust melted and generated the fault.