575M radio is near dead

My OEM radio/nav units days are numbered. Screen is half blacked out and makes entering commands hit and miss, bringing up some questions as follows
1.is this unit rebuildable? If so Who is the contact?
1.1 are there refurbished Beckers out there that are plug and play with this car?
2.if not rebuildable what is the best replacement? With blue tooth, music streaming, nav is not a must
3.will a replacement radio cause immobilizer gremlins?
4. Will a replacement radio connect to CD player in trunk?

 

Thank you I found them.
Just had a passenger attempt to open pass door from inside with lock on and popped the rod off inside the door. How do I remove the door panel