I need new lights/bulbs because mine are very dim. The actual light assembly is fine, so could I just replace the bulbs or is it all one piece? I don't think the bulbs are separate from the reflector part, but if so that would be nice. Thanks! Also, there are fog lights under the bumper that have never worked since I owned it, how can I tell if there is a wiring problem or just both bulbs are broken? Thanks again!