If yours has stopped working it might be dry solder joints. Give it a few thumps with someone holding the brake and if it flickers its likely that. Mine had this issue so i just reflowed the solder joints and all good.
Note that you will need to cut away some of the plastic surrounding the PCB to get access to the solder joints but if you leave enough so it holds together and the plug still clips in correctly you'll be laughing and have saved a decent bit of coin