Hi, I have a rattle just above the driver's head that sounds like it is a sunroof part bouncing/rattling/vibrating periodically- it does it periodically riving down the highway. Is there something that I can tighten up in there? I've seen the threads that suggest lubing the parts but I tried that (a while ago so maybe I can't remember correctly) but couldn't even see anything to lube. Is there a cover that is easily removable possibly? I have an 04 with 110K miles. Thanks, Dan.