Freelander 2 (LR2) Central Locking Actuator ,front doors

Both front doors now only lock/unlock intermittently on the keyfob .. tried wd40 into mechanisms without success. looks like an actuator replacement both sides. only vid i can find on youtube is by an American guy who makes it look a mother of a job including removing the window glass completely to get access (?) and very inaccessible cable attachments that look tough to get off so goodness know how you reattach to the new unit in situ..

Would love to hear from anyone who's tackled this job successfully with any tips ?

thanks

Richard

As its two, I wonder if there is something else, bad earths, connections etc