I have the exact same problem. Same side and it goes all the way down on the left side and a bit higher on the right (same as wild driver).
Sometimes it goes down on its own, sometimes when I put/take out some weight in/out the trunk while the car is parked and most of the time when I jack up one of the wheels.
After I start the car it goes back up. It is been doing it at least once a week for the past 6 months. The car has 90000 miles (2001) and the left rear bag has never been changed. I don't believe it is be the bag as it only does it 1/20 times I drive the car (daily driver). The compressor blew the fuse this winter once (ice build-up in the air intake).
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