player1:

If you are having left channel audio out problems you should contact your dealer.

Many Audya owners on SZ including myself have had the same problems.

Based on what I've gathered, it is a motherboard problem. If you are still under warranty, contact your dealer ASAP.

The Audio problem will not go away.
The rattle you hear inside, is probably a board mounting screw that came loose and fell out.

Ironically, I had the exact same thing as you. ( Screws Loose )and Left Channel audio out.

If you are a new member here, just spend some time reading the many posts here. It won't take you long to see your problem is shared by many other Audya owners.

Jim