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UPDATE:
It was a very easy fix!
The roof hydraulic motor is located in the rear trunk:
Simply unfasten the bolt on the right holding it down (you only need to unfasten one bolt)
Lift the metal piece holding the foam enclosure in place and
gently cut the two pieces of tape holding the top piece of the foam enclosure to the bottom piece (at the seam of the enclosure) and you will have access to the hydraulic motor.
Mine looked to be out of hydraulic fluid:
Lift the motor gently, unfasten the fluid reservoir fill plug with a 4mm allen bit and refill fluid.