Audit formulas for errors

Audit formulas for errors in Google Sheets — with a ready prompt for the moment it comes up.

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Written for the moment this actually comes up.

Decide — diagnose the stuck moment

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I copied a pricing table into Financials Q2 and now the main total dropped by 12%. Finance emailed…

Totals changed after a copy-paste and I don't know where

I copied a pricing table into Financials Q2 and now the main total dropped by 12%. Finance emailed me that totals changed but they won't say what they edited. I don't know which formulas were overwritten versus which depended on a deleted sheet. What is the most likely diagnosis and the immediate diagnostic steps I should take to locate and repair the errors without making more edits live?

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