I will be changing the Astra J rear cluster light bulb i hope this video helps you. Disclaimer: I will not be held responsible if something goes wrong.
Great video, I got 'CHECK BRAKE LIGHTS' warning on dash, I checked lights visually, the bulbs seems to be working, Do you think I am missing something as I read somewhere other bulb takes over if one goes out?
Best to open the cluster and make sure you see all bulbs switch on, if its throwing code 16 (break light) then either bulbs out or if you got your bulbs changed recently they put in the wrong bulb