SC430 Chris

Hello, I have a 2002 SC430 which is in excellent condition and stock other than the rims. Since I live in South Dakota, I only drive it in the summer months and store it in my heated garage during the winter months. Everything has worked great until this summer. On my Navigation, I am getting the "no disc detected" message. I tried cleaning the dvd drive and that did not work. Additionally, my display unit quit tilting. The door opens and closes but it will not tilt. I would love to keep the oem look but would like to update to the gen 4 system if possible. Any idea who would have the necessary components available? Thank you in advance.