That sounds bad. If you saw it cook the motor's external power connections then all bets are off. It may be beyond garage repairs.
You've probably been through it already but I'd first check the power source. Could provide a clue as to how badly things were affected. Was that rail overloaded? Was something shorted? There could also be damaged traces or ribbon and you could end up with a similar or worse problem if you don't catch everything.
If you do start swapping parts stick with identical revisions. Some models let you get away with more than others.
Spending more time now on research will improve your chances. Keep asking and searching. I haven't had to fix any modern caviars but you can bet plenty of people have. Lots of those things out there.
The only other thing I can offer is to suggest you experiment on donor drives. Better to get a feel for the parts on a cadaver than a patient. The first couple repairs are dicey.
Good luck!
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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