I have done the pump on both my dodges in the last 2 years, both times the pump itself started weeping. I may not have noticed when it was a small leak, but when it starts to drip a decent amount, the radiator fan "redistributed" the fluid in such a manner that, other than the smell of coolent, it would be difficult to locate the actual leak. You could try looking at the pump at idle to see if you can see anything. Good luck.
Matt