Hydraulics system roof in T5 Cali Technical Question

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Hello,

I got small riddle with my T5 California, for some time one actuator from the roof falls going down ,and finally there is the problem of the closure of the roof.I have a question Is the actuator can will repair .Or just i have exchange for a new one. If only new, my question is how later Vent pump.This what can i see in the ETKA that the actuator is part of the exchangeable. After change how to vent the hydraulic pump V118?
Who changed the roof actuators.???