You might simply have this simple problem which is easily fixable if you know what to look for and what to do. Check that first because it's the easy part.

Also check to make sure that the problem isn't at the amplifier end of things. Just because there's no noise coming out of the left rear doesn't mean it's something wrong with the player. It could be something wrong with the amp or the speakers. That's also easy to check.

If all else fails, then yeah, contact support.