Hi,
I among many other users am also suffering from this known uj141 blue-ray drive problem. The fact why the issue is not getting much attention might be because probably less than 10% of sold G73Jh units came with a blue-ray drive and most of them are outside U.S.
As I've understood the problem occurs because the uj141 isn't wholly Win7 compatible. The only complete way to really fix the issue is a RMA, which Asus will do if you can come to a contact a senior tech via support. They'll replace the optical drive with another model for you.
There is a way to get through the issue without changing the drive, however. In Windows device manager you can rollback the driver of the Intel SATA controller. If you do this, the system reverts to using Microsoft default SATA drivers for drive control (those are used in safe mode as well). Using these drivers the uj141 drive works without hitch for both blue-rays and DVD's.
I was skeptical at first but now after using those Win7 default SATA drivers for three months I'm satisfied enough and haven't noticed any decrease in hard disk perfomance, for example. So I decided that a month long RMA (outside U.S.) isn't worth it and I'm still successfully using the uj141 drive with these default drivers.
Decided to post this if it would help you or anybody else.