I took my Boxster S MY01 to the Porsche dealer in Roswell Georgia yesterday with the same issue....interior lights not working unless the key was in the ignition and turned on.
The problem wasnt the Transport mode....but that a piece of the security system module had been replaced....it was described as a "plug and play" type of action that a previous owner took. Probalby related to water getting on the modules behind the drivers seat. The tech told me that when the module was replaced it was never programed so the computer basically had no idea the car had interior lights. He programed it and told it what all options were in the car...wala...interior lights work nicely now.
G
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