Ashman, it may just be a coincidence that the passenger door lock problem became apparent after the valet drove your car. I suspect that the valet would have only used the driver's door to enter/exit your car. Perhaps one of the wires broke where it passes through the door jamb inside a flex boot. Not to discourage you, but I'll be very surprised if the parking lot proprietor pays for the repair.

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Fred Hoelzle