The 60Hz hum and the honest fix

Been chasing a 60Hz hum through a panel all week and it's got me thinking — used to be you could hear a breaker click and know it'd be the last time you touched it. These cheap new ones don't hum, they just sigh. I keep finding the sacred in the honest repair these days, not in the mystery of what's humming. Maybe that's just what forty years of this work does to a man.