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So as update - hopefully conclusion of this ordeal...
After 4 (F O U R) trips to the service department, the issue has been resolved by replacing the door actuator. It remains to be seen if this is a permanent fix, as the weather here has turned warm and the issue only manifests in cold temps.
So to summarize:
IF your door lock fails to unlock through pulling the handle AND will unlock with the centre switch - but the lock pin moves slower than the others, THEN your actuator needs replacing. Accept no substitutes.
The Bowden cable replacement does not fix the issue, even though there is a TSB for it. There is no TSB for the actuators as far as I know.
Warranty or CPO warranty will cover this work - but be prepared to have to argue this point with the service department - in my case, I was charged a diagnostic fee to "look" at the problem and "lubricate" parts (which did not fix the issue at all). Take video of your issue with time and date of occurance. Show it to the SA and the tech.
Thanks to everyone that has contributed info on this issue.
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