Hi I have a 2011 roadster that the roof failed due to a leaking lower left main lift cylinder ( which was caused by the tape being wraped around end of cylinder which shaft clevis pushed the tape into the seal). I contacted Klaus @ Top Hydraulics and ordered both left and right cylinders. I followed the sevice manual (link below). You had to lift roof unit out but did not disconect pump or electric cables and rested on timber to access lower cylinders. It took about 6 hours to complete and replace what oil was left. Nissan Australia wanted to charge me $19000 AU to replace the whole system. Thanks to Klaus and other members of this forum for information they have supplied. Also see photos below.
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Factory Service Manuals - NICO Club
Bruce N.S.W Australia