[Perfectlap]

did the Check Engine Light come on when she was driving it? If so run out and buy an OBD II scanner from Pep Boys and plug it into the diagnostic port under the dash nearest the driver door (should have purple plastic around the port) to find out the error code.
The scanner will link up with the Boxster's computer and spit out a numeric code.
Log onto Renntech.org and look up the error code. I just went through this whole process that concluded with a new throttle body.

These scanners are good piece of mind so that you aren't wondering whether your non-Porsche tech is bull****************ing you.

I also always check my electrical fuses for the vain hope that the repair is a 50 cent fuse.