How to troubleshoot a malfunctioning brake light on an Audi A5?

I've noticed that one of the brake lights on my Audi A5 is not working. How can I troubleshoot and fix this issue?

First, check the fuse for the brake lights. If it's blown, replace it with a new one. If the fuse is fine, then the issue may be with the bulb itself. Check the bulb and replace it if necessary. If the problem still persists, it may be an electrical issue and it's best to take your car to a professional mechanic.

Make sure to also check the wiring and connections for the brake lights. Sometimes, loose connections can cause one of the lights to malfunction. Also, check the brake light switch to see if it needs to be adjusted or replaced.