2008 I4 AWD sport dealer will replace water pump at 50,183 miles. Definitely leaking onto pulleys and belt. Solid white crystals are on the inside of the hood (the black felt material) directly above the belt and pulleys. Service was kind enough to show me the signs of leakage (although no leaks, pink crust, etc were ever found on my driveway, garage, work parking lot, etc): 1) markings inside the hood, 2) pink crust lodge inside the pulleys, 3) white marking across the belt and on the pulleys. All evidence that supersedes the TSB on how to diagnose the water pump leak (search forum for TSB 011711).
Fortunately I have the 100K platinum $0 deductible VSA to cover all the expenses related to this issue. A new but of course similar WP will be replaced at no charge. According to service rep and tech, very possible the pump began to leak nearly 4-5months ago (i.e., about 42-44k miles). I think way earlier since I remember seeing the debris on the inside of the hood about 1-1.5 years ago when applying belt dressing to the belt; i assumed it was related to the belt dressing... boy was I wrong.