When I first got my car (2014) I had a local company install HIDS. They used what looks like a slim ballast with a converter kit. As of now, one side flickers badly if it ever cuts on at all. I think its probably the ballast. My question is whether or not it is necessary to remove the bumper to install a new ballast or could I somehow just unplug all the wires remove the ballast and install a new one right in its place. I don't want to take it to the previous shop as there product seems very low quality. Anyone have any experience with this?