I have a rattle in my passenger side lower door panel. If I place my hand firmly over the speaker cover or the surrounding carpeted area the rattle stops. Unfortunately, I can't remove the speaker cover and see what's going on in there. I've pulled on it but it won't budge, it feels as if any more force may break it. Also, I don't see how the carpeted lower door panel comes off. How do I access this area? TIA

 

I believe the whole door panel is one piece...