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For a PCB it’s called a rework, and it’s very common for first spins of boards to have to do one.

Also common is to patch around issues, when possible, in firmware. This is often lower cost/effort, but can’t fix everything.

There are similar kinds of fixes for purely mechanical parts. Depending on the part and problem, mechanical can be easier than a PCB rework (eg: modify a part in CAD and 3D print or get your local machine shop to do a run).

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Or require a particular type of motor oil with a particular type of metal-based lubricant additive when you realise 100,000 cam shafts have shipped made of metal you’d assumed was to a higher spec but isn’t, just so the engine will make it through warranty period with insanely long service intervals.

I briefly looked at a couple used vehicles just outside of warranty and one within warranty that had literally had two oil changers in 100,000k, that’s 60,000 miles for the uninitiated.

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