Specialist company looking for the basic setting of the Vario roof

Hello together, I got a first hand R170 2001 in March, which was gapless with Mercedes to the service and HU. Unfortunately I constantly have problems with the roof, he was several times at Mercedes to the employment, but afterwards the next no longer works. Is there a specialist company, which employs the corresponding experts to the complete basic adjustment of the roof? Optimally wise in the area of Saxony, but also likes to drive into the workshop, if this lo The problem began with the fact that only the boot cover opened under sunlight and the roof only shrugged but did not open, then it worked in the second or third attempt of the switch actuation. The friendly was informed that the roof setting is faulty and it is set. After a short time the same problem started again after collection. The boot cover was set, so it worked for three days. Then the unlocking cylinder in the roof was set. leaks. So in the free workshop, leave the cylinder with a sealing kit and new vehicle sky and again three days later, under sunlight, the boot lid no longer closes 100%, that is, the tips are slightly high and the sides of the triangle discs no longer travel up and the warning sound sounds. After again resetting the boot lid in the free workshop, this now worked 2 days, same problem, under sun radiation the Lid again not right and has to be pressed manually. Now I have the hope that it is a specialist company that has perhaps specialized on Vario roofs, it gets it, that this roof just works as it probably was intended by Daimler. If someone has a good address in this regard, I would be very grateful!