Resurrecting a zombie MUM 5 (mum56z40) food mixer

There, fixed it. Milled out the burnt pcb area with a dremel and a tiny drill bit (0.8 mm). Made sure not to leave any black area on the pcb, basically creating an "air gap". Then filled it with epoxy.

This was the state of the mixer before fixing the pcb - a zombie. Not dead and unresponsive, yet seemed to have a life of its own:

When plugged in the engine starts working, even though the main switch is in the "Off" position, you can see the arcing towards the end of the video.