There's a couple of post on the other forums about people having the same exact problem as you do: the driver side latch disengage while the passenger doesn't. I've asked one of the most recent guys if he has any feedback (since nobody ever reported back about it)
I suspect there's something going on with the little distribution box that takes the one cable coming from the handle and splits it to 2 cables going to the individual latches
I don't believe that you can access the latch from the kidney grill since the latches sit behind the radiators.
I believe you may have better chances by removing the center plastic of the underbody and going up to the latch from there.
I'll take a look tonight at my car and see if I can see a route. I'll also take a look at Rehingold and see if it has any information.
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