Wow! I don't know how much you know about electronics. I've had a ham license since I was 15. Looks like it started with a short in that center structure which is a bifilar toroidal transformer with at least two ruptured electrolytic capacitors, fried output transistors. You had a FIRE for a brief period of time. That circuit board is made of an epoxy fiberglass laminate and it takes a hell of a lot of energy to burn one like that. In my experience, a 20 amp fuse would have popped LONG before this kind of damage would have occurred. I would make absolutely sure that fuse wasn't bypassed. That was a CATASTROPHIC failure. Very impressive!! Pull the fuse and see if you still have 12volts on that connector; if so, somebody bypassed that fuse. That board is COOKED!! Thanks for sharing. Hope that helps.
Ty
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