Navigate to System Preferences for iCloud
Open the Apple Menu and Navigate to System Preferences, then click on Apple ID.
Within your iCloud settings, uncheck Find my Mac.
You will be prompted to type in your Apple ID password and the feature will be successfully disabled.
You're now all set!
We can now move forward with servicing your Mac!
Log into iCloud on a different computer
Open a web browser and go to: icloud.com
Click on Find iPhone
After authenticating and logging into iCloud, click on the Find iPhone button in the lower right corner.
Choose your device
In the list of devices, choose the device to be serviced.
Remove the Device
After a few moments of searching, the device will be unavailable and the ability to Remove from Account will appear. Click on the "Remove from Account" text.
You're now all set!
We can now move forward with servicing your Mac!