Hi Guys. Just purchased a new 2007 Tahoe LTZ, 4x4, with Navigation & Entertainment System. I noticed quite a few posts about different glitches with these new vehicles and quite a few updates coming out for them, such as AMR discs, etc. Is there anything I should do to update my current system before using the vehicle for radio features or vehicle enhancements? I got the extended warranty so if there are any immediate things I should have the dealer fix, please let me know ASAP. Please advise.