DRU-500A dead

I have a Sony DRU-500A with firmware 2.0G (upgraded from a DW-U10A drive).

It was working fine until a week ago, when I heard strange noises inside the drive. Like the lens topping on one side pretty hard, and not recognizing CDs or DVDs.

Today it is completely dead. Windows says insert media, although I put media inside. Takes forever to read the media, hangs explorer, and then it does not work.

If I downgrade to DW-U10A, will Sony help me on warranty claim? Does Sony give warranty to their OEM drives?

Please advice.