I cut out the section between the sound bar and the fireplace with a sharp utility knife. This gave access to the screws and space to lift the fireplace a little out of the bottom holder. Lay it on it's face and remove the panel for the bulbs. I replaced all of mine at the same time, even tho some still worked. When you put the fake brick back up use a LITTLE construction adhesive and the repair is unnoticeable unless you get real close.
Remembering now... Lift unit up and off mounting screws behind unit, no screws to remove. Sometimes (a lot) I get CRS.