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They'll always reset an error that's not easily reproducible and see if it comes back. They are just troubleshooting the issue. If he keeps getting misfires they'll replace the spark plug for the misfiring cylinder, if he's still having misfires they'll then replace the coil pack. If the issue persists they'll look at the injectors, rest of the fuel system etc. Some dealers don't even do that, they just identify the cylinder having a misfire, say cylinder 3 and swap the plug and pack with another cylinder to see if the misfires "moves". If it does it means it's a bad plug and/or pack. If the misfire stays it's something else such as the fuel system.
The main thing is that the dealer has this issue on record and is addressing it.
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