Don't know if this has been posted yet, but here it is just in case.
The NHTSA has issued a recall notice for rear diff seal affecting the Pontiac Solstice
NHTSA CAMPAIGN ID Number : 07V589000
Go the website http://www.nhtsa.gov/
and click on Recalls, Defects and Complaints Databases link on the left part of the screen and proceed from there.
Looks like the recall doesn't start until February.