Hello Paul
How are you doing? Please try to perform the procedure below. If it fails, you will need a scan tool or take it in to the dealer so they can perform the reset.
1. Enter the vehicle and make sure that all doors are closed.
2. Push the odometer reset button while turning the ignition key on.
3. Continue holding down the odometer reset button for approximately 10 seconds until the "Service Reset" message appears in the information center.
4. Release the odometer reset button and press the reset button on the bottom of the wiper stalk.
5. It may take a few attempts with this procedure.
6. If the light is not reset, then a Porsche compatible scan tool will be required to reset it.
Hope this helps and please let me know if there's anything else I can add or help you with.
Thank you
Relly