Today, I went to the local dealership to have a rear-end squeak investigated on my 2009 Sonata GLS (2.4L-4cyl Automatic) with 25K miles. The squeak has yet to be resolved, however while I was there, the service manager told me of a new TSB for my vehicle that just came out on June 9, 2010. The TB7 Campaign 10BA23R0 pertains to the ECM module with regard to automatic transaxles. No further information was given by the either the service manager or mechanic regarding this TSB other than it being a software update for shifting issues. Have not noticed any significant changes in behavior as of yet, but looking forward to next trip into Colorado Rocky Mountains where I have experienced some unusual shifting behaviors in the past. Will follow up within next few weeks after I check it out in the mountains and on the highways.