[Richard Curtis]

1. How old is the battery? If it's past the end of the warranty, it's good money that you have a bad battery.
2. Regardless, yes, clean all the terminals, battery connections, chassis ground connections, etc.
3. You could try jump starting it. Just follow directions and be careful.
4. Or you could remove the battery and take it to an auto parts store where they will do a load test on the battery (and usually they'll recharge it if that's all it needs; also it's free) and sell you another one if needed.
5. Not open on Saturdays, but Chapman Autowerkes is in your neck of the woods. I use 'em whenever necessary, but lots of good Porsche shops around.
6. Join AAA. Good insurance if you drive a 26-year-old car.