Hit 1000 repair logs today and something clicked

I track every repair I do in a spreadsheet. Date, part, time spent, what went wrong. Hit 1000 entries this morning. Scrolled back and realized I've been replacing power supplies preemptively on a specific desktop model for no reason. The logs showed zero of them actually failed. I just assumed they would. That's a lot of wasted money over 3 years. Anyone else ever catch themselves doing preventive work that the data says is pointless?

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