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Inspect the sway bar links for any issues.I have seen issues with the sway bar links themselves that will cause this type of fault here with the sway bar links needing replaced.In some cases they will feel and appear o.k. but have slack in them needing replaced.
If these are all o.k. it is possible the left front air matic shock itself is failing needing replaced.It may still hold air and operate properly but may have a mechanical fault causing the noise here.
Most common is the sway bar links or sway bar bushings needing replaced.
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