The hydraulic actuators basically have two compartments which take oil, from the resoviour when you operate the roof ,simply put one is for the roof up position and one compartment is for the roof down position. When you operate the roof the hydraulic fluid is pumped from one compartment to the other via the pump and this operates a clogged gear that pushes the roof mechanism up or down . These actuators are one each side of the car located behind the drivers and passengers door pillars and are and intergal part of the roof frame, IE you cannot replace them without removing the roof assembly, in my experience they rarely go wrong . As you know from repositioning the pump there are 4 hydraulic pipes that come out of the pump, 2 of these pipes fill the up position compartments of the actuators and the other two the down position compartments , so as the pump runs it pushes fluid into the feed pipes for up or down position as you've selected and the fluid in the compartment already full is simply pushed back down the other lines and back to the fluid resoviour , so your leak is possibly from either of the two pipes at that actuator being damaged , it's difficult to say which pipe because they will both be under pressure when you operate the roof up or down . The other and less likely fault might be that one of the pipes isn't seated properly in the actuator . They are held in with metal clips that allow the pipe to rotate in its fixing port , it's possible that when repositioning the pump you have over stretched the pipe and the clip has come out slightly causing fluid to leak past the fixing . Or that you have split the pipe over stretching it . Or as the pipes are carefully positioned around the roof frame to the drivers side from the pump ,that when repositioning ,you have moved or dislodged a pipe and it's been pinched in the mechanism and is now leaking .
