no shouldn't have done anything to the actuator. the likely hood is if there was no clip the pipe has popped out when under boost (very likely) when I replaced my intercooler one of the clips for the boost pipes was not fitted properly and as soon as I put my foot down the pipe blew out, there's a hell of a lot of pressure in the system and without any clips there is nothing to hold the pipes in. If your mechanic has lost the clip and not replaced it then its his responsibility to fix it, take it back to who did it and tell them its not been right since they did it.