I work for a dealer and although it'd be unusual to see one leaking at 70K miles (we rarely ever replace them), I'd think that it might be covered by VIP IF that's the "certified warranty" that you're talking about?
Anyway.....IF it is really leaking, although the labor to replace it would be less with the t-belt removed (as one's already there), there'd still be some labor charge as one must still R&R the pump and scrap off the old gasket to replace it so labor to do that would be additional to the T-belt (not free) yet less than doing the job normally while the t-belt's off.
Now................being that you obviously have your doubts or you wouldn't be posting this here asking about deemed criminal actions, why not simply go there and ask the service writer to show you the leaking water pump before it's replaced? If it's really leaking (seaping), they shouldn't have any problems showing you the pump while still on the car with the t-belt cover removed.
With any part that I condemn, I can prove it to anyone who asks at anytime as I have no need to make up BS and try selling parts that aren't really bad. There's plenty of real work out there so that any real, honest techs don't need to make up BS to make a living.
If the pump isn't really leaking but just has some slight evidence of minor seapage and isn't covered by VIP, then pass on the pump as it probably won't cause you any problems. I see pumps where there's slight evidence of minor seapage at what looks like a "freeze plug" (casting plug) but if it's not dripping coolant from the front cover under pressure (should be pressure tested to be sure), then I don't even mention it to the service writer as it's not a problem worth bothering with IMHO.
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