Sony rdr-gx210 will not read dvd?

SONY RDR-GX210
ok well my question is quite simple i know why its not reading dvd's its because the laser is duff. so the drive needs to be replaced, but where on earth do u find such parts i have searched the net, and asked the approved sony repairers but they dont reply to my emails.
i have taken the old drive out but cant find a part number on it, was hoping it was going to be similar to a computer drive but it has a small foil ribbon cable instead of a pc ribbon cable.

if anyone can point me in the right direction and give me a part number i would be very gratefull. astragte@aol.com
i am in the uk by the way.