Interior door handle problem

AlexMac

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Right folks, not my car (I'm with the A3 crowd), but I've got a puzzling problem with an early TT (99/2000 era).
The drivers side interior door handle is not reliably releasing the door.
The problem has been intermittent since the car was picked up a week ago, but at best pulling the interior handle allows the door to be pushed open, at worst it remains solidly shut. Exterior handle works perfectly all the time.

I whipped the lining off expecting the bowden cable to be dodgy/broken, but it seems fine. I even swapped the n/s & o/s cables over and exactly the same thing. Passenger's door works fine, driver's is unchanged.
With the lining off, door open and latch in the 'closed' position, I tested the release and it WILL work, but only if I pull the cable a fair bit further and harder than the interior door handle can.
It's almost as though the cable has stretched, but swapping it over hasn't fixed the issue.

To my mind there are only 3 elements involved:
Interior handle itself. (Seems fine, not visibly worn or bent)
Bowden cable. (Seems fine, and swapping over for the one from the opposite door has no effect)
Lock mechanism. (Nothing seems to be missing/broken, and it WILL work but only if the cable is pulled a long way)

Sooooo.......has anyone experienced anything similar and if so, what did they do to resolve it?
Don't really want to recommend a new lock assembly if it's not at fault!
Thanks for any input anyone can offer.
 

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