My 06 Solstice w/Manual Trans has a problem not shown on your list: Excessive Pinion and Ring Gear howl noise only on the steady pull side, not on decel or coast side. The noise is loudest at a steady throttle range of 35-45 mph which generally means 3rd or 4th gear, but I can also duplicate the noise in the other gear ranges when the engine is under a steady throttle. Since I have had no fluid leaks from the rear diff, I am choosing to take a wait and see approach for now to see if it get worse with more problems than just this excessive howl noise. At some point in the near future I will ask the dealer to fix this noise problem as it is both annoying and embarassing to hear this ugly noise while driving an otherwise beautiful looking and running car. I have 5900 miles on the car and it was put in service on 12-2-05. I first noticed the gear howl noise at about 2000 miles, but the noise has gotten louder this year. /Bob W