Freelander 1 back doors: central locking and speakers

Hi all!
Going to start with (hopefully) the easy stuff on the car.
Central locking on one of the back doors doesn't unlock (but it does lock).
Back speakers don't work.

Is it easy to get the door cards off and to get access to the locks and speaker wiring?

Going to try WD40 on the locking mechanism first...

Also one of the back windows doesn't work but not even going to think about that one!!

Window problem is usually down to the mechanism cable snapping. You tend to get a short warning period where the window moves but sounds 'orrible and then it stops!

is the button down for the back doors as child protection ?

lol no!