Dead Commodore 64 with multiple faults repair - Shorted 9V, faulty video, strange keyboard input

An old and dirty Commodore 64 that was dead. No video, and a short on the motherboard.
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It turned out to have at least four different faults, and it took some time.
Can it be fixed ?
Part 1 of 2.
Part 2: • Dead Commodore 64 with...
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