Part link for the drain pump ==> http://www.repairclinic.com/PartDetail/Drain-Pump-and-Motor/642239/1387293

Academy Fellow Kurtius expertly guides us in this repair kata:

I find removing the outer door panel is helpful...remove the 6 screws, 3 left,3 right on the inner door edges.

Next spot the galvanized strip above the sump access...it has a plastic wire channel attached to it and a screw holding it on either end. Remove the screws and have a helper hold it up out of your way, no need to detach the wire channel.

The only other thing in the way is a corrogated plastic hose slipped into a hole in the sump...simply pull it out and move it to the side.

This should give you enuff room to get at the small plastic release tab and twist the pump out of its position.

Hope this helps!

Source: Bosch SHE55M05UC Not Draining - can't access drain pump