So I aquired my '01 986 S back in March of this year from a non Porsche dealership. Tried different avenues in recovering history service records and have come up dry. The car is nearing 90k miles and 10 years and feel like I should invest into performing some preventative maintence, to include a new water pump, coolant flush. The car runs great and doesn't nor come close to over heating. I just looked at outside of the pump and it looks in pretty good shape. I know that the propeler inside of it is the main concern, but is there a way to tell if the part is the original or aftermarket replacement? I tried looking for the stamped Porsche part number (986.xxxxxxx) but no luck. I saw a num on top of it stamped (120280). Also, what does everyone here recommend, replacing it with Porsche original or aftermarket?
2nd question.
Since aquiring my car, the auto-dimming mirror doesn't work. The indicator light on it comes on and off when the button is pressed, but it doesn't make a difference. I've tried looking for the fuse, but didn't find any dedicated fuse in the listing nor fuse box. I feel that it's not the fuse cause the indicator light on the mirror lights up when the button is pressed.

But I'm lost
Thanks