Is my 16102B dead?

Hello, I have a Liteon 163 DVD and 16102B CD-RW. I recently upgraded the DVD drive to JLMS GH5Q region free and thereafter noticed that the 16102B gave a disk not found error although it shows all signs of being alright according to the Nero info tool and various other check utilities. The DVD drive is now back with it’s original firmware and the CD-RW still continues to play up. It seeks the CD for a second or two and then the HD works flat out for a few seconds whereafter I get the disk not found message. I have spent 2 evening searching the net, reading articles and flashing the CD-RW with mtkflash with various firmware versions without any luck.

Can anybody help me on this issue?

Thanks,
Steve