Don't remember 100% but I from inside the trunk you should see a couple bigger plastic nuts, if you don't see them you need to peel the carpet back to access them. Unscrew these and the light housing should pull out from the outside. Then you can just turn the bulb socket and pull it out and replace. I did this outside of advanceauto last year before we headed out for a ski trip so it wasn't that bad at all.
I just had to do this myself the other day. I pulled back the carpet and pulled off the 3 plastic nuts then pulled the whole light out. Then you can take out just the socket for the bulb. Then you can pull the light bulb out and put the new one in. It was easy once I found the directions.
my 2009 malibu was doing the fast blinking on the right side, went outside and sure enough it wasn't blinking in the rear, only in the front. I was a little freaked out thinking it was something bigger but as this thread has shown, it must be the bulb, thanks!
Edit: Can anyone confirm that the replacement bulb is in deed the 3157 not the 3156?? I have a 2009 Malibu LS
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