Sure sounds like a broken lever to me. It should be under warranty. If not, you will need to try to isolate which side it is coming from. At the top of each rear trailing arm there is a rubber cover. See if you can get someone to rock it while you listen to both sides. If you can tell which side it is, then you will have to remove the cover, etc. I had mine repaired under warranty so I don't have a step by step for you but maybe someone else can chime in. It has happened to a few of us. LOL
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