Hi,
You'll have to get inside the door to see what's going on. It's most likely that the Rod which runs from the Lock Cylinder to the actual latch has come loose. Taking off the door panel is pretty straightforward, but you need to disconect the Battery due to the side AirBag (so you'll need you Radio Code).
Only you can gauge whether it's a D.I.Y. job for you. It certainly is for me... BTW, when did Porsche start putting Lock Cylinders in the Passenger Side Door? My '99 doesn't have it.
Happy Motoring!... Jim'99
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