Hello

I am over seas and trying to order the correct piece to fix my car.

A few months ago when i went to lock my car all the doors would lock, but the driver passenger would lock and immediately unlock causing all of the doors to unlock.
Now the front passenger door is stuck locked and all of the doors automatically relock after opening the door. If i am outside the car and press the unlock button on my thing they will unlock for a second then relock.
The doors also only open from the inside due to always being locked automatically
The guy here says i need a door lock actuator and lock assembly. Is this true and where can i find one at online.
I am trying to sell the car before i leave please someone help me out

 

It may well matter which door, but especially car details (see below)

 

It is a 2000 S-Type V8. I am about to just order the actuator and the lock assembly and hopefully that is what he needs.