There are no parking lights located in the rear hatch. The rear parking lights are the lower and middle lights in the lamp assembly in the fender. The lights in the hatch are the backup lights and a rear fog light on the driver's side.
You may want to closely inspect the tail lamp housings where the bulb sockets insert for melted plastic causing an intermittent connection. I have also seen cheap bulbs cause issues.
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Mercedes Benz Master Tech - Retired
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