I have a burnt pcb too but mine can still work. I fix back in leaving a small gag without touching the heatsink.
I suspect that burnt portion is cause by the heatsink. The temp should be around. 48 to 58'c  no more than. 59
Put a box fan or household fan right in front of the coincraftdesk where they are sucking the air . It shild be stable when. You got your replacement.