I had a recent discussion with my Silicon Valley Dealer regarding the "leaky water pump" issue. Apparently if it is "seeping" from the small drainage hole at the bottom of the pump, BMW's guidance is not to replace it under the warranty. This is the manner in which the pump is designed to function. However; if there is coolant anywhere else to any measureable degree (heatshield, on the ground, etc) then that is a candidate for replacement.
Mine is accumulating only a very small seepage amount at the drainage outlet at the bottom of the pump only.
1988 Goldwing SE
2012 K1600GTL-Current Bike