Hello Nate1074,
Thanks for using the Apple Support Communities! I understand that you are having an issue with a red line at the top of your Apple Watch. I'm happy to provide you some information.
You can take the device into a store for evaluation. After examining your Apple Watch, the technician will confirm if there will be any cost for service. You can find locations close to you by going to Apple - Find Locations. This will also give you contact information and allow you to make a reservation.
Also, you can reach out to Apple Support for further assistance.
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Have a great day!