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The water pump doesn't leak; it just stops working. Waiting for it to leak as a trouble sign will do you no good. The only way to tell if the pump is going bad is to periodically scan the car with a BMW scan tool and look for water pump trouble codes.
The N54 requires plugs every 45,000 miles, so you are 12K away from needing new plugs. It's always good to "baseline" a used car with a complete compliment of new operating fluids so you can keep track of the maintenance schedule, whichever one you choose to follow.
Good luck with the car and I hope you enjoy it!
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