Sony RW AW-G170A not reading Scorpio DVDs



[qanda]This thread is about the Sony AW-G170A / DRU-170C. Click here to see full specs[/qanda]Hi. I bought a Sony RW AW-G170A in June 2007. It was working well until last month. Then it couldn’t read Scorpio DVDs. It was reading Sony, Imation and Discovery DVDs well and I burnt many DVDs too. I have about 100 DVDs burned in Scorpio. These Scorpio DVDs are in good condition and I checked in my friend’s computer. Can anyone help on this issue? Else I have to go to service centre. Thanks in advance.