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I'd be careful with backprobing. You don't want to introduce extra components into the circuit that wasn't intended to be there.
On the 2 small pictures, what you're checking for is broken wiring. You unplug the harnesses they show. Then you set your multimeter to check for resistance and probe the 2 points they show. If you have continuity, you will be able to read a resistance. If you have no resistance, you have a broken wire and you have to track down where the damage is.
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