If you still have the original box, then there is a small rectangular barcode label on the side (i.e. stuck on, not part of the box itself). The barcode has an alphanumeric string printed underneath it, that will be the serial number.

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Less is more.

Sorry ...

I don’t have the box

Where can I find it if i don’t have the box?

The head unit should be able to display the electronic serial number of your right pedal at least. It may be stored in your activity log files as well.

If you need more than that, you need to call Garmin Customer Service.

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Less is more.