the first problem happened to my car not too long ago. i found out that it was my locking assembly, but i was like you and thought it was the actuator. so i took it in to my mechanic bc mine is a 2door, and its kinda tough to replace that bc the window and everything is in the way. but part and labor was around $400.
It would be a good idea to replace that... if you cant mess with the door handel and make it slightly work at all.. then its the actuator... if you can get it to work just a little.. then it might just be hung up.. and either not tight any more.. or bad all together... best bet.. get a new one.. or take the panel off... and see for your self how it works.. and what its doing...
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