DS7 driver door not opening

Hi everybody yesterday I couldn’t open the driver side door from the outside. The car unlocks all doors but doesn’t open the driver side but from inside I can open the door without any problem. I read that maybe lubricating the lock might be the issue.
I tried to lubricate the lock from the outside with no succes so I removed the door card which wasn’t easy and was able to remove the lock to the side without removing the cables that go to the handles and added more lube. This worked yesterday but today at first it didn’t open but after opening from inside it started working again.
I’m thinking of ordering a used lock from the wreckers but I need help, how do you remove the cable from the exterior door handle? Also am I right to assume the problem is with the lock?