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I can't think of an easy way to fix this.
Start at the box, make sure it is screwed down under the bar. Then start taking apart boxes along the way to check the white wire. All the connections should be accessible.
I like to turn off the breaker when I dig in the boxes then turn it back on to measure things. Less chance of ugly black marks on the wall. Check hot to neutral for a dead circuit or use one of those (Voltage ticks?) that beep when AC is present.
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