Hello...
I own a shop in Baltimore where we repair OEM Radio's.
You problem is not uncommon. The power supply for the LED's might have failed. There are other reasons that might be as well.
Anyways, $375 is a bit high, we do this type of repair for around $250. If you wanted you could ship us your unit and we could do it for you.
Purchasing a new radio off of ebay is a bad choice, as another post suggested. You radio is a Class Two Data bus unit. It will only "turn on" if connected to the correct BCM with the correct VIN LOCK. The radio off ebay will not work in your car unless the dealer uses a Tech 2 to decode it. Also, the unit off ebay will most likely be not tested for the above reason, even if they say it has been.
If this interests you, or anyone else email me and I can give more info.
snipped-for-privacy@soundsolutionsmd.com Owings Mills MD 21117