There is a switch in the trunk on the right, on the hight of a passengers shoulder. It detects the landing of the roof package in the trunk. Hardly ever fails, but who knows.
Then the two hall sensors on the right hydraulic ram are critical due to corrosion inside. If there are minor traces of rust on the front side, get it replaced with an E88 part.Details in the HowTo section of the UK Z-Forum.
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