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The biggest issue for this fault here is the rear hatch latch itself.It fails to release electronically and causes the noise you hear without the release.If it was not lifting or lowering automatically but was releasing and latching properly then this would be a concern with the hydraulic lift that a leak may occur with or a weak lift motor but this isn't the case on this model here.
The latch inside the rear tailgate fails and needs replaced to correct this fault.Mercedes has released a technical service bulletin on this fault as well.Bulletin number T-B-72.20/59e.The new latch is slightly updated.
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