Then, you may request service for Surface from Microsoft if it is under warranty.
Usually, Surface and Surface-branded accessories come with 90 days of technical support and a one-year limited hardware warranty.
According to Microsoft, everything on the unit is erased if you send it to the service center.

Microsoft wont be responsible for data loss during servicing.
Step 2: Download, install, and launch MiniTool ShadowMaker Trial Edition.
Step 4: TapDESTINATIONand choose a partition on your external hard drive.

Step 5: Tap onBack Up Nowto begin the backup task.
These files contain your email messages, tasks, calendar, and other items on your Surface.
Wonder how to backup Outlook data files?

To prevent privacy leaks, you had better delete the data by yourself before sending the equipment to Microsoft.
To protect your privacy, the latter two options are recommended strongly.
For partition wipe, refer to this guide How to Wipe Partition | MiniTool Partition Wizard Tutorial.

Step 2: In Windows 10, navigate toUpdate & Security > Recoveryand clickGet startedunderReset this PC.
In Windows 11, chooseSystem > Recoveryand clickReset PCfromReset this PC.
Step 3: ClickRemove everythingto continue.
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Step 4: Complete the resetting task by following the popped-up instructions.
Later, your machine is fully restored to its factory prefs.
Then, you could send your Microsoft Surface to the service center.
How to safeguard your data during computer repair?
Here are multiple safety tips you should follow to protect privacy when fixing a computer.
Final Words
Thats a full guide on how to prepare your Surface for service.
Do those things by following the given steps when your Surface goes wrong and needs to be repaired.
For more information, refer to this official document Set up your Surface after service.