It shouldn't be doing anything microbially at that temperature. Can you confirm that it is actually producing gas or is it just bubbles like you would see if you shook it up?
pull the cork on the one with the most bubbles. if its fizzy, drink it and worry about the rest. if its still, drink it and don't worry about the rest is what I would do.
pull the cork on the one with the most bubbles. if its fizzy, drink it and worry about the rest. if its still, drink it and don't worry about the rest is what I would do.