Gremin is my hero, I had same problem on my wd420. My water was pouring out during fill.
Underneath the drawer, there is a rubber tube, connecting the drawer to the drum, This is how I done it.
I removed the two screws from the back, and tried to slide off top, it didn't slide, so tried various ways, checking for extra screws then I gave it good thwack with ball of hand and it came off,
I undid soap dispenser, but in honesty I didn't need to, as I have small hands, so I could get under the drawer, and reconnect the pipe, and loop the rubber ring on the pipe, on the stickyout thigme of the drawer. All working, but that rubber pipe is loose, think I may have to get a jubilee clip.
Sarah., August 2013