Ok,
So I am a new (used) Jeep owner, and I bought a 2005 Jeep Grand Cherokee Limited, Fully loaded...I have a few questions
1) There is a plastic plate attached under the shifter knob, on the Shifter Control, its like a cover plate so you do not have to see the greased parts down below, and somehow this plate brok away, leaving only a sliver left around the knobs pole. Can someone tell me what this plate is called, and are the easy to replace or should I head to the dealer for this?
2) One of my two support struts for the back hatch(door) is not working at all, it will not open the hatch up for me, I have to open it all the way manually, again is this something simple to pick up and install myself?
3) The Navigation system...hmmm...worked great at first, then after a really hot day I am getting a disc reading error, tried everything and nothing worked. Took the disc out for 2 weeks, put it back in and then it was working again...no reason....now the car has sat for a week unattended, and sure enough the darn thing has got a disc error again. Any suggestions?

I know everyone will say, its all covered under warrenty, however I bought the Jeep after it was returned to the dealer from a 3 year Lease. A seperate company then sells them, so the dealer is really not invovled. I purchased a warranty from this company but I am not sure what their Bumper to Bumper warranty really covers...I think i need to get the part numbers first to know if each item is covered. This brings me to another problem, where online can I find part numbers for very specific parts as mentioned above?

Any and all help provided would be greatly appreciated,
Thanks