There's probably a relay that's just for the tails or they may be linked with the front parking or positioning lights. If not that then it could be the light switch which is a common problem on these cars. A look at the schematics is the only way to find the potential causes other than 'diagnosis by parts replacement'. I just fixed a similar problem -a daytime running light relay $60. Maybe there's an online source for Boxster schemantics.
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