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Re: 14-3 (red wire on neutral bus bar)
That looks to be service equipment (because the grounds and neutrals are on the same terminal bus), thus they did not attach the red to the "neutral" terminal bus, they attached the red to the "ground" terminal bus.
Just like has been discussed here as a good place to terminate the ends of unused conductors - terminate them into the ground terminals so if they are accidentally energized they are already connected to ground.
The other end of that red conductor would, I presume, have also been tied to ground, probably in the same wire nut which has the ground conductor in it.
Somebody forgot to cut off some excess wire coming out of that ground terminal.
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