Land Rover door actuator



My recently purchased a 2004 land rover that had only 1 door actuator working(front passenger side). It was suggested that if I fixed the front driver side, it might fix all the other doors. It didn’t, but now both front doors do work with the remote. The local Rover Dealer said that no matter how unlikely, the other 3 actuators were probably bad. I replaced 2 more actuators(one back door & tail gate). That didn’t fix anything, the 3 rear doors still don’t work. Any suggestions?