My machine was making the same noise, especially then draining the tub. I tipped the machine over and notice the pump had some calcium build up. Clearly I have a slow leak. I took te entire motor and pump bracket off the machine and found the motor had rust build up as well. I took the entire motor assembly apart, used CLR and 2000 grit sand paper to clean the rust off the motor parts, cleaned up all the calcium off the plastic and motor brackets, lubed the seal with some vaseline, lubed the other moving parts with some WD40 and put it all back together. Th process took about an hour.
I could have saved some time by only removing the motor asembly and not the entire mounting bracket for the pump. There is a plastic catch you need to lift in order to twist the motor out. Make note of which way the motor and wires are positioned and mark the outside of the motor.
Harrison, December 2008