Hello all.   
  
We have a 2008 SEL with 30,000 miles.  We are the 2nd owners.  The original battery failed a few weeks ago.  An new battery was installed at Sam's Club.  Last week we discovered that the CD Changer is dead - Initially played a CD, but would not eject it, and now will not play.  Chatters when Eject is pushed.  This was the first CD we attempted to play, and I cannot be certain that it ever worked.  At the same time we attempted to change to the Sirius Radio and received a message directing us to the dealer.  The AM/FM and Sync functions continue to operate normally. 
  
We took the verhicle to the dealer, paid $91, and were told that both the Changer (entire dash unit) and the Satellite module need to be replaced - $300 each + $185 in labor. 
  
Could the battery swap have caused these issues?  Is there a fix or suggestions?  Is aftermarket really a viable option?  Is there a repair facility competent with these units?  How about a supplier of "gently used" factory components? 
  
Thanks 
Larry