Can the cause of this flash arcing be repaired?

Can the cause of this flash arcing be repaired?

My GE Profile 1.5 cu. ft SS Microwave/Convection Wall unit was purchased in 2006 and began flash arcing in 2014. I removed the non-metal plate on the inside right wall and discovered a 'burst' laceration measuring about 1/4" through the underlying metal wall. Obviously unsafe to use, especially leaking radiation.

ANSWERS: