Lorraine B Beachwood , OH January 04, 2017 Appliance: Model BOSCH WFMC3301U4/04 Drain pump needed replaced due to e04 error code for bosch nexxt 500 series washer Took off the top, control panel, door, door gasket, and door panel. Removed old drain pump motor assembly as described in a YouTube video I watched, installed the new drain pump motor assembly, and reassembled the washer. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 2+ hours