Just wondering if in the last year, someone has had to replace their water pump.

A couple of days ago my ML started making a peculiar noise on start-up. Seemed to increase with a little throttle and then went away. Hard to describe the noise...kinda' like a whistling and rubber squeal....I believe my water pump bearing might be on the way out. Can't believe I only got 230,000 miles out of original........

Anyway, I'm keeping an eye (an ear!) on it and if not to difficult, plan on changing it myself. Anybody with ML water pump replacement advice ?

Thanks.......