If the threads get stripped out then it is likely that you will need to replace the pedal body and the battery door. You can order the pedal body and new battery door directly from Garmin.
There are two options for the Right pedal depending on if you have a Vector 3 (dual sensor) or Vector 3s (left only)
Vector 3 right pedal body (need small parts kit above also): https://buy.garmin.com/en-US/US/p/pn/010-12757-00
Vector 3s right pedal body (no battery compartment): https://buy.garmin.com/en-US/US/p/pn/010-12757-02
The kits above will allow you to replace the damaged parts without having to completely replace the pedals. The Vector 3 support page has a nice video about how to do the maintenance on the pedal. When you have them apart, you can swap the old parts for the replacement as you are putting them back together.
Hello, thanks so much for replying and offering help
Just swapping in a new left pedal body looks good to me. If I ordered the left-pedal body and switched the electronics in myself, I could send the damaged left pedal body away to Garmin to be inspected under warranty?
That way, I wouldn't lose any time with the power meter.