After reading up on the posts on how to replace the door lock module, I successfully replaced the faulty lock module with one I bought from ebay that was new from Germany (not original)
The door lock module is now working, locking and unlocking.
However, since replacing the module I have noticed that the door sticks and needs a push when trying to open (when sitting inside). Opening the door on the outside you don't notice the door sticking, but when pulling the handle from the inside - the door unlocks but needs a nudge to open. This does not happen to the other doors, just the one I replaced the lock module on.
I first thought it was the clip for the cable on the door handle was not pulling enough, so I adjusted the cable to it highest grove in the door handle - still same issue.
Any ideas what it can be? and what to do to fix?